Merge "check-flagged-apis: handle nested flags" into main am: 7c71d88e

Original change: https://android-review.googlesource.com/c/platform/build/+/3079003



Change-Id: I132dd6e63ccd32f5acf28e335cf3326417e16936
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>