ASoC: msm: qdsp6v2: increase the number of channels supported

Increase the number of channels supported for cpu dai. "Slimbus4 Capture"
cpu dai needs to provide voltage and current data from codec to ADSP
for all the speakers connected to codec.

Change-Id: Id156e87ee704929d400b0e1ff20a8d9c8e4aa1cc
Signed-off-by: Anish Kumar <kanish@codeaurora.org>