[automerger skipped] [RESTRICT AUTOMERGE] mediaserver, mediaextractor, drmserver: allow vendor_overlay_file am: 621e3e3ace -s ours

am skip reason: subject contains skip directive

Original change: https://android-review.googlesource.com/c/platform/system/sepolicy/+/1561695

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I75656169527bbe2425d87c0cd96081ae8323ca67