Merge "Remove ?= assignements to product variables" into main am: cbe61221...

Merge "Remove ?= assignements to product variables" into main am: cbe61221 am: 07829d80 am: 0ed4cb57 am: 0e0fe0e5

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2779549



Change-Id: Ifdd0a8cdd61ec58fd374f3846c4a91d9db1d20aa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>