aoc/alsa: add interal_mic_us_tx backend for ulstrasonic capture Added tinymix controls: 274 ENUM 1 INTERNAL_MIC_US_TX Sample Rate SR_96K 275 ENUM 1 INTERNAL_MIC_US_TX Format S32_LE 276 ENUM 1 INTERNAL_MIC_US_TX Chan Two 436 BOOL 1 EP5 TX Mixer INTERNAL_MIC_US_TX Off Bug: 215418484 Signed-off-by: Xinhui Zhou <zxinhui@google.com> Change-Id: Iae18d5b80cb34562271f4706ffe4ac417457f1ca