Merge "Use fixed timestamp in img files using an environment variable" into...

Merge "Use fixed timestamp in img files using an environment variable" into main am: 8915bf61 am: e3027ab8

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/3440059



Change-Id: I7f7df25b8448630a09850c4497ab228313e03e50
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>