Always use aapt2 for prebuilt appcompat

Running appcompat is missing a dependency on aapt/aapt2.  There
is no need to switch between aapt and aapt2, so always use aapt2
and add the missing dependency.

Fixes: 130575935
Test: treehugger
Change-Id: If32c03410fbdb3945bf20f7405de13dc8cd83038
diff --git a/core/app_prebuilt_internal.mk b/core/app_prebuilt_internal.mk
index b429dca..dd263dd 100644
--- a/core/app_prebuilt_internal.mk
+++ b/core/app_prebuilt_internal.mk
@@ -200,6 +200,9 @@
 $(built_module) : .KATI_DEPFILE := $(built_module).d
 endif
 endif
+ifeq ($(module_run_appcompat),true)
+$(built_module) : $(AAPT2)
+endif
 $(built_module) : $(my_prebuilt_src_file) | $(ZIPALIGN) $(ZIP2ZIP) $(SIGNAPK_JAR)
 	$(transform-prebuilt-to-target)
 	$(uncompress-prebuilt-embedded-jni-libs)
@@ -216,11 +219,7 @@
 	@# Only strip out files if we can re-sign the package.
 # Run appcompat before stripping the classes.dex file.
 ifeq ($(module_run_appcompat),true)
-ifeq ($(LOCAL_USE_AAPT2),true)
 	$(call appcompat-header, aapt2)
-else
-	$(appcompat-header)
-endif
 	$(run-appcompat)
 endif  # module_run_appcompat
 ifdef LOCAL_DEX_PREOPT