ASoC: msm: qdsp6v2: Add support for multiple slots in auxpcm data

Auxpcm data can be placed in multiple slots in one frame.
The number of slots that can be in one frame is determined by
diving the number of bits per frame with bits per sample. For example
in 256 bit frame size configuration with 16 bits per sample
there will be 16 slots.  ADSP currently supports receiving
information on four slots, however the driver only supports
one slot. This change adds support for multiple auxpcm slots.

Change-Id: Icfa3fd0cba5d2009be89d9230494d2a33a7b930c
Signed-off-by: Damir Didjusto <damird@codeaurora.org>