Merge "Revert "Make the intent of TTY_PREFERRED_MODE_CHANGED protected"" into sc-qpr1-dev am: 7141413c13

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/15999809

Change-Id: Ifd365f193c4982d5608ae722afb4c43c2ec83fda