Merge "Revert "Make the intent of TTY_PREFERRED_MODE_CHANGED protected"" into...

Merge "Revert "Make the intent of TTY_PREFERRED_MODE_CHANGED protected"" into sc-qpr1-dev am: 7141413c am: 8d811bf9 am: ee1d7916

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

Change-Id: I8f016e7986d74cd3238e33bcf850d44bce362a67