Merge "Revert "Reapply "release_config: build flags can be lists""" into main...

Merge "Revert "Reapply "release_config: build flags can be lists""" into main am: cc318d33 am: 9717c3fe

Original change: https://android-review.googlesource.com/c/platform/build/+/2818084



Change-Id: I9f84cc91fcaaaddb71e6a3f0b0d3b12648cb69ec
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>