Add a flag for TvMediaOutputDialog.

Adding the flag to the SettingsLib since changes are being made here, in
the TvSystemUI, SystemUI and TvSettings and SettingsLib is accessible in
all of these places.

Bug: 303205631
Test: manual - added flag usage to TvSystemUI and SettingsLib and flag
worked as expected

Change-Id: Id8158f084f6c355f92c0ec864d649c1cb178cf38