Add some new predefined output switcher subtexts

Specifically:
- SUBTEXT_ERROR_UNKNOWN,
- SUBTEXT_DEVICE_LOW_POWER,
- SUBTEXT_UNAUTHORIZED,
- SUBTEXT_TRACK_UNSUPPORTED,

Bug: 266923039
Test: atest MediaRouter2HostTest
Change-Id: Ife8f44396a76823f3fc2d5a10fc403e45d9ff016
2 files changed