[automerger skipped] DO NOT MERGE: Revert "Map TYPE_TRUSTED_APPLICATION_OVERLAY to system window type for A11y" am: 0cf0d420e1 am: 4e58604920 -s ours am: 6b51131818 -s ours am: 8d26628c4b -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15975850

Change-Id: I3386665386a3dbd65c6bef81fcb10256889278e6