Adding METADATA to piex and merging with upstream am: f85cc3c7c1 am: fb64679d7c

Original change: https://android-review.googlesource.com/c/platform/external/piex/+/2224358

Change-Id: I4a59d7b5def1fc3ea1057336d4e175ddec8825a5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>