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 am: 43bdfb26

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



Change-Id: Id8bc442599a0adc1fc8a53c5e11a1d6bac0589bc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>