Merge "aconfig: add api to create flag info file based on package map and flag...

Merge "aconfig: add api to create flag info file based on package map and flag map file" into main am: cf3042db

Original change: https://android-review.googlesource.com/c/platform/build/+/3023823



Change-Id: Ia44177b81be4c5dd374757ed1494feda2e4f89d9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>