android: freedreno: Another build fix

During build on Android 10, build error occurred:

'''
[ 26% 456/1718] Gen Header: libfreedreno_registers_32 <= a3xx.xml.h
FAILED: out/target/product/pinephone/gen/STATIC_LIBRARIES/libfreedreno_registers_intermediates/registers/adreno/a3xx.xml.h
/bin/bash -c "PATH=/usr/bin:\$PATH python3 external/mesa3d/src/freedreno/registers/gen_header.py external/mesa3d/src/freedreno/registers/adreno/a3xx.xml > out/target/product/pinephone/gen/STATIC_LIBRARIES/libfreedreno_registers_intermediates/registers/adreno/a3xx.xml.h"
Traceback (most recent call last):
  File "external/mesa3d/src/freedreno/registers/gen_header.py", line 470, in <module>
    main()
  File "external/mesa3d/src/freedreno/registers/gen_header.py", line 446, in main
    xml_file = sys.argv[2]
IndexError: list index out of range
'''

Align build rules with meson fixes it.

Fixes: 62ebd342 ("freedreno/registers: split header build into subdirs")
Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
Acked-by: Rob Clark <robdclark@gmail.com>
Acked-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6170>
diff --git a/src/freedreno/Android.registers.mk b/src/freedreno/Android.registers.mk
index 8fe713c..f66e577 100644
--- a/src/freedreno/Android.registers.mk
+++ b/src/freedreno/Android.registers.mk
@@ -42,6 +42,8 @@
 	@echo "Gen Dummy: $(PRIVATE_MODULE) <= $(notdir $(@))"
 	$(hide) touch $@
 
+RNN_SRC_PATH := $(MESA_TOP)/src/freedreno/registers/
+
 # This is the list of auto-generated files headers
 LOCAL_GENERATED_SOURCES += $(addprefix $(intermediates)/registers/adreno/, \
 	a2xx.xml.h a3xx.xml.h a4xx.xml.h a5xx.xml.h a6xx.xml.h a6xx-pack.xml.h adreno_common.xml.h adreno_pm4.xml.h adreno-pm4-pack.xml.h)
@@ -49,47 +51,47 @@
 $(intermediates)/registers/adreno/a2xx.xml.h: $(LOCAL_PATH)/registers/adreno/a2xx.xml $(MESA_TOP)/src/freedreno/registers/gen_header.py
 	@mkdir -p $(dir $@)
 	@echo "Gen Header: $(PRIVATE_MODULE) <= $(notdir $(@))"
-	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $< > $@
+	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $(RNN_SRC_PATH) $< > $@
 
 $(intermediates)/registers/adreno/a3xx.xml.h: $(LOCAL_PATH)/registers/adreno/a3xx.xml $(MESA_TOP)/src/freedreno/registers/gen_header.py
 	@mkdir -p $(dir $@)
 	@echo "Gen Header: $(PRIVATE_MODULE) <= $(notdir $(@))"
-	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $< > $@
+	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $(RNN_SRC_PATH) $< > $@
 
 $(intermediates)/registers/adreno/a4xx.xml.h: $(LOCAL_PATH)/registers/adreno/a4xx.xml $(MESA_TOP)/src/freedreno/registers/gen_header.py
 	@mkdir -p $(dir $@)
 	@echo "Gen Header: $(PRIVATE_MODULE) <= $(notdir $(@))"
-	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $< > $@
+	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $(RNN_SRC_PATH) $< > $@
 
 $(intermediates)/registers/adreno/a5xx.xml.h: $(LOCAL_PATH)/registers/adreno/a5xx.xml $(MESA_TOP)/src/freedreno/registers/gen_header.py
 	@mkdir -p $(dir $@)
 	@echo "Gen Header: $(PRIVATE_MODULE) <= $(notdir $(@))"
-	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $< > $@
+	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $(RNN_SRC_PATH) $< > $@
 
 $(intermediates)/registers/adreno/a6xx.xml.h: $(LOCAL_PATH)/registers/adreno/a6xx.xml $(MESA_TOP)/src/freedreno/registers/gen_header.py
 	@mkdir -p $(dir $@)
 	@echo "Gen Header: $(PRIVATE_MODULE) <= $(notdir $(@))"
-	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $< > $@
+	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $(RNN_SRC_PATH) $< > $@
 
 $(intermediates)/registers/adreno/a6xx-pack.xml.h: $(LOCAL_PATH)/registers/adreno/a6xx.xml $(MESA_TOP)/src/freedreno/registers/gen_header.py
 	@mkdir -p $(dir $@)
 	@echo "Gen Header: $(PRIVATE_MODULE) <= $(notdir $(@))"
-	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $< --pack-structs > $@
+	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $(RNN_SRC_PATH) $< --pack-structs > $@
 
 $(intermediates)/registers/adreno/adreno_common.xml.h: $(LOCAL_PATH)/registers/adreno/adreno_common.xml $(MESA_TOP)/src/freedreno/registers/gen_header.py
 	@mkdir -p $(dir $@)
 	@echo "Gen Header: $(PRIVATE_MODULE) <= $(notdir $(@))"
-	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $< > $@
+	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $(RNN_SRC_PATH) $< > $@
 
 $(intermediates)/registers/adreno/adreno_pm4.xml.h: $(LOCAL_PATH)/registers/adreno/adreno_pm4.xml $(MESA_TOP)/src/freedreno/registers/gen_header.py
 	@mkdir -p $(dir $@)
 	@echo "Gen Header: $(PRIVATE_MODULE) <= $(notdir $(@))"
-	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $< > $@
+	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $(RNN_SRC_PATH) $< > $@
 
 $(intermediates)/registers/adreno/adreno-pm4-pack.xml.h: $(LOCAL_PATH)/registers/adreno/adreno_pm4.xml $(MESA_TOP)/src/freedreno/registers/gen_header.py
 	@mkdir -p $(dir $@)
 	@echo "Gen Header: $(PRIVATE_MODULE) <= $(notdir $(@))"
-	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $< --pack-structs > $@
+	$(hide) $(MESA_PYTHON3) $(MESA_TOP)/src/freedreno/registers/gen_header.py $(RNN_SRC_PATH) $< --pack-structs > $@
 
 LOCAL_EXPORT_C_INCLUDE_DIRS := \
 	$(intermediates)/registers/adreno/