Do not generate greylist if UNSAFE_DISABLE_HIDDENAPI_FLAGS=true

Fixes: 122957987
Test: UNSAFE_DISABLE_HIDDENAPI_FLAGS=true make droid
Change-Id: I0b5a18b9d989667122ad942b185b826b637fad89

Android.mk

@@ -78,6 +78,7 @@ checkbuild: doc-comment-check-docs
 update-api: doc-comment-check-docs
 
 # ==== hiddenapi lists =======================================
+ifneq ($(UNSAFE_DISABLE_HIDDENAPI_FLAGS),true)
 .KATI_RESTAT: $(INTERNAL_PLATFORM_HIDDENAPI_FLAGS)
 $(INTERNAL_PLATFORM_HIDDENAPI_FLAGS): \
     frameworks/base/tools/hiddenapi/generate_hiddenapi_lists.py \
@@ -108,6 +109,7 @@ $(INTERNAL_PLATFORM_HIDDENAPI_GREYLIST_METADATA): \
 
 $(call dist-for-goals,droidcore,$(INTERNAL_PLATFORM_HIDDENAPI_FLAGS))
 $(call dist-for-goals,droidcore,$(INTERNAL_PLATFORM_HIDDENAPI_GREYLIST_METADATA))
+endif  # UNSAFE_DISABLE_HIDDENAPI_FLAGS
 
 # Include subdirectory makefiles
 # ============================================================