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: 336d458c am: 879284e9

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



Change-Id: Ic48a50b07fac6ed6a9538d9142eb381361f222de
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>