linux-imx

ASoC: codecs: fsl_mqs: Add PM support

Save the values of registers at suspend and restore
it at resume.

We don't need to implement runtime PM support because
MQS is already enabled in startup() and disabled in
shutdown().

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Shengjiu Wang <shengjiu.wang@nxp.com>