Merge "aconfig: cache flag value in generated java code" into main am: da886603

Original change: https://android-review.googlesource.com/c/platform/build/+/2802758



Change-Id: Id26d889a02342f983a6c48d9b42b343a2fb9c6fb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>