Require MODIFY_PHONE_STATE for preferred TTY mode
Now that ACTION_TTY_PREFERRED_MODE_CHANGED is no longer a protected broadcast, require the sender to have MODIFY_PHONE_STATE. Bug: 169196062 Test: atest TelecomManagerTest, manual Change-Id: I9e16429e25faa326dfa1f93284c34346573320ee (cherry picked from commit 7fa20a84e387e3e9ec0c5e5fc5510749d2db0ed6)
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