Merge "[aapt2] Add placeholder --feature-flags flag" into main am: 28226eec72

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2806055

Change-Id: I86a8d09e7910e2ac17f667dc6917dbd37015dc4d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>