Merge "Filter read-only + disabled flags from aconfig_flags.pb" into main am: 59de3af2

Original change: https://android-review.googlesource.com/c/platform/build/+/3388764



Change-Id: I303dc0868928c0f0c43e891b1d5db0a4b38c555d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>