ASoC: msm: set default I2S SR to 48Khz on APQ8096 I2C

Set default I2S sampling rate to 48khz on APQ8096 I2C.
This is required for super wideband testing. Add mixer
control to set sample rate.

CRs-Fixed: 1113633
Change-Id: I5dbde6d6fbe0d1e522ef99aed7f2bc8bde2fe04a
Signed-off-by: Josh Kirsch <jkirsch@codeaurora.org>