ASoC: codecs: lpass-wsa: fix VI capture setup.

Merge series from srinivas.kandagatla@linaro.org:

This two patches fixes below two issues with the VI setup.

1. Only one channel gets enabled on VI feedback patch instead of two
channels
2. recording rate is hardcoded to 8K instead dyamically setting it up.

Both of these issues are fixed in these patches.