sm6250-common: audio: update audio_io_policy for VoIP

Add VoIP Tx app type config for pcm and low-latency captures.

Bug: 133297310
Test: make a voip call

Change-Id: I5dd67167b7568fd08a7ae979b50417f2627dc7d9
Signed-off-by: justinweng <justinweng@google.com>