ASoC: sdm660_cdc: Add writeable registers for Dig_cdc and sdw codec regmap

Add Writeable registers list for Digital codec and soundwire codec
regmap config to avoid invalid register access during reg_cache_sync.
Ensure digital codec clock is enabled before regcache sync to avoid
AHB access errors.Modify mutex use to avoid clock disabling during
regmap register access.

Change-Id: I8ab84f80298e01d145395f1347352afe5cfbcc9e
Signed-off-by: Ramprasad Katkam <katkam@codeaurora.org>