Fix incremental builds with AAPT2

When we removed the src/ directory, the R.stamp file was removed -- with
AAPT, this triggers src/android/Manifest.java to be regenerated. But
AAPT2 only uses the R.stamp file as a timestamp to find the
Manifest.java file, not to create it.

So add a new CleanSpec.mk to fix the builds by removing the target that
AAPT2 uses to generate the src/android/Manifest.java file.

Test: None
Change-Id: If56f326ad701f7f92aa7c8aeda57e92d9c62cff9
diff --git a/CleanSpec.mk b/CleanSpec.mk
index f153de0..bbeac6c 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -390,6 +390,11 @@
 $(call add-clean-step, rm -rf $(TARGET_OUT_COMMON_INTERMEDIATES)/previous_gen_java_config.mk)
 $(call add-clean-step, rm -rf $(TARGET_OUT_COMMON_INTERMEDIATES)/current_gen_java_config.mk)
 
+$(call add-clean-step, rm -rf $(TARGET_OUT_COMMON_INTERMEDIATES)/JAVA_LIBRARIES/*/package-res.apk)
+$(call add-clean-step, rm -rf $(TARGET_OUT_INTERMEDIATES)/APPS/*/package-res.apk)
+$(call add-clean-step, rm -rf $(TARGET_OUT_COMMON_INTERMEDIATES)/APPS/*_intermediates/src)
+$(call add-clean-step, rm -rf $(TARGET_OUT_COMMON_INTERMEDIATES)/JAVA_LIBRARIES/*_intermediates/src)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************