USB Audio: Add USB HiFi routing

Let USB HiFi BE as a standalone bind/src command to AoC.
And fix that USB HiFi Rx no audio after the other touch
sound's UC and BE is closed.

On top of the change of pa/1959717
(pa/Ib82ff06986ebe97d472f4518aa136f32da30da66)

Test: Local test
Bug: 191222376
Change-Id: I1017aab232bd2e929dc4caa9939f0613ba937f86
4 files changed