audio VTS: Fix handling of ULTRASOUND sources

When opening a stream on an ultrasound input
(AUDIO_INPUT_FLAG_ULTRASOUND), the source type
AUDIO_SOURCE_ULTRASOUND must be used.

Bug: 231275185
Test: atest VtsHalAudioV7_0TargetTest
Test: atest VtsHalAudioV7_1TargetTest
Change-Id: Ib1fb5b8218eb0c52edf31789fa937c0a8b6c5082
Merged-In: Ib1fb5b8218eb0c52edf31789fa937c0a8b6c5082
(cherry picked from commit 1ce9d548)