Refactor helper fuction to internal tiles package. am: 2f8e79327c am: 6fff6a0c7d am: c2abba1fcf am: e0390aea76

Original change: https://android-review.googlesource.com/c/platform/external/avb/+/2055334

Change-Id: Iaaa96dbf4ed2107d82f17a89cc6c3032a9d18e8b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>