ASoC: qcom: add mic support

This patch adds mic support to the lpass driver, most of the driver is
reused as it is, only the register level access is changed depending on
te direction of the stream.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Acked-by: Kenneth Westfield <kwestfie@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>