HACK: disable most of the build for riscv64

Disable most of the inherited product makefiles so that `m droid`
passes, and then add back a few working packages to PRODUCT_PACKAGES.

Test: lunch aosp_riscv64-userdebug && m droid
Change-Id: Ifbc4758735ec29876cbdd5a2ec97dd99aaebc210
diff --git a/target/product/aosp_riscv64.mk b/target/product/aosp_riscv64.mk
index 518f8b1..012cc41 100644
--- a/target/product/aosp_riscv64.mk
+++ b/target/product/aosp_riscv64.mk
@@ -30,33 +30,41 @@
 
 # GSI for system/product & support 64-bit apps only
 $(call inherit-product, $(SRC_TARGET_DIR)/product/core_64_bit_only.mk)
-$(call inherit-product, $(SRC_TARGET_DIR)/product/mainline_system.mk)
+#$(call inherit-product, $(SRC_TARGET_DIR)/product/mainline_system.mk)
+TARGET_FLATTEN_APEX := false
 
 #
 # All components inherited here go to system_ext image
 #
-$(call inherit-product, $(SRC_TARGET_DIR)/product/handheld_system_ext.mk)
-$(call inherit-product, $(SRC_TARGET_DIR)/product/telephony_system_ext.mk)
+#$(call inherit-product, $(SRC_TARGET_DIR)/product/handheld_system_ext.mk)
+#$(call inherit-product, $(SRC_TARGET_DIR)/product/telephony_system_ext.mk)
 
 #
 # All components inherited here go to product image
 #
-$(call inherit-product, $(SRC_TARGET_DIR)/product/aosp_product.mk)
+#$(call inherit-product, $(SRC_TARGET_DIR)/product/aosp_product.mk)
 
 #
 # All components inherited here go to vendor image
 #
 #$(call inherit-product-if-exists, device/generic/goldfish/riscv64-vendor.mk)
-$(call inherit-product, $(SRC_TARGET_DIR)/product/emulator_vendor.mk)
+#$(call inherit-product, $(SRC_TARGET_DIR)/product/emulator_vendor.mk)
 $(call inherit-product, $(SRC_TARGET_DIR)/board/generic_riscv64/device.mk)
 
 #
 # Special settings for GSI releasing
 #
 ifeq (aosp_riscv64,$(TARGET_PRODUCT))
-$(call inherit-product, $(SRC_TARGET_DIR)/product/gsi_release.mk)
+#$(call inherit-product, $(SRC_TARGET_DIR)/product/gsi_release.mk)
 endif
 
+# TODO: this list should come via mainline_system.mk, but for now list
+# just the modules that work for riscv64.
+PRODUCT_PACKAGES := \
+  init \
+  linker \
+  shell_and_utilities \
+
 PRODUCT_ARTIFACT_PATH_REQUIREMENT_ALLOWED_LIST += \
     root/init.zygote64.rc