Revert "Make the intent of TTY_PREFERRED_MODE_CHANGED protected"

This reverts commit 1646f642e13a6592b8f7d7ede4b39d5802b9901c.

Reason for revert: this change caused regression of b/169196062.

Bug: 201580114

Change-Id: Ia577a2360b3bfed50ddb1c80d28716273e65cead
1 file changed