Merge "Define release flags in starlark instead of make" am: 593bef7150 am: 11a113676a am: 0cd220797b am: 0bbfa29e0c am: f32b752484

Original change: https://android-review.googlesource.com/c/platform/build/+/2617915

Change-Id: I8de1d6da3d58608ba845755b6f5d969411a612fd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>