ASoC: mdm8630: Fix to support for primary auxpcm

Update the MUX value for primary auxpcm, and also
remove the clock function from the startup and shutdown
functions since that is done in msm-dai-q6-v2 for
auxpcm.

Change-Id: I12a09a746942b69c3126fcdbc7f9d297678a7a05
Signed-off-by: Vicky Sehrawat <vickys@codeaurora.org>