Merge "build system to create flag storage files per partition" into main am:...

Merge "build system to create flag storage files per partition" into main am: 27cf1a5c am: 35fb20af

Original change: https://android-review.googlesource.com/c/platform/build/+/2908579



Change-Id: I5189259019c4455e0f27d8ea4477b00a91fa4dff
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>