Merge "aconfig: create flag value file" into main am: 12eacc1e am: 2ed4060e am: 3ab52497

Original change: https://android-review.googlesource.com/c/platform/build/+/2901788



Change-Id: I6ef2762c01d75a5935552408319aa533a11a15ab
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>