Audio HAL: extensions for new SoC features

Extended audio offload structure: added support to add bit_width,
offload buffer size and usage info.

Add support for direct PCM audio stream. Direct PCM stream
is used when pcm data required post processing in DSP. Direct PCM
stream is used for both track offload and PCM offload.

Add audio proxy source device.

Add support for additional audio formats: EVRC, QCELP, WMA, WMA,
AAC_ADIF, AMR, MP2, FLAC, ALAC, APE, DSD, LDAC.

Extend audio channel mask.

Test: make
Change-Id: I15be7e726c62d52cd81a4864087fab471dd7c3c2