Merge "Define odm_available property to install a vendor variant to odm" am: 65490b8c

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1542687

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ib8d493751e7b5067841862204b2852b25a2eb29e