audio: add audio_channel_mask_contains_stereo

This is used to determine track channel mask
eligibility for stereo spatialization.

Bug: 303920722
Test: manual

Merged-In: I33e92a4341e7d265cec07237db4538e4629076d4
Change-Id: I33e92a4341e7d265cec07237db4538e4629076d4
2 files changed