platform: generic-x86_64: Remove external/lk/lib/rust_support dependency

This path does not work in the android manifest and we are addding this
as an implicit dependendy for all kernel rust modules anyway.

Bug: 304585390
Test: trusty/vendor/google/aosp/scripts/build.py generic-x86_64-test
Change-Id: Ifd5287a4969ec1bdfa641925ff8f496ae6c7d3f4
diff --git a/platform/generic-x86_64/rust/rules.mk b/platform/generic-x86_64/rust/rules.mk
index 8238d1d..6a71969 100644
--- a/platform/generic-x86_64/rust/rules.mk
+++ b/platform/generic-x86_64/rust/rules.mk
@@ -8,7 +8,6 @@
 	$(LOCAL_DIR)/src/lib.rs \
 
 MODULE_LIBRARY_DEPS += \
-	external/lk/lib/rust_support \
 	external/rust/crates/acpi \
 	external/rust/crates/log \