[automerger skipped] DO NOT MERGE: Revert "Map TYPE_TRUSTED_APPLICATION_OVERLAY to system window type for A11y" am: 0cf0d420e1 am: 349eb4dff7 -s ours am: 920515f493 -s ours

am skip reason: subject contains skip directive

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

Change-Id: I2bdfef99f1c483a1c11e78707c514c26142de9e8