Adding METADATA to piex and merging with upstream am: f85cc3c7c1

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

Change-Id: I6a7460821bfe56371107f7c68e233643fb552a7e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>