Add (e)ARC cases to AudioAttributesUtils

Not having these cases causes the (e)ARC device to not be selected
properly in the SystemMediaroute2Provider when switching back to this
route.

Bug: 304370989
Test: Switch from ARC to Bluetooth to ARC in media output dialog - sound
should be heard via the ARC device.

Change-Id: I60a44df100a4bf735b6198447471b330dd867779