Allow TV devices to report default route of builtin speaker

Some Andorid 14 TV devices have received updates to logic allowing for
differentiation of device routes including built in speakers.

Bug: 389835202
Bug: 389009009
Fixes: 389835202
Fixes: 389009009
Test: atest MediaRouter2HostSideTest
Change-Id: Id16f2c5a32186db175413986f7c8042e85c582e4
Merged-In: Icc832b90fdfd7da78c4817921db534f434d5cf29