ASoC: wcd9335: Sync codec digital registers using regcache_sync_region

Codec digital registers need to be synched once codec is
out of digital power collapse. regcache_sync_region will
sync only part of the hardware registers. Change uses
regcache_sync_region to sync codec digital registers
after codec is out of digital power collapse. This will
avoid synching of all the codec registers.

Change-Id: Ib86ff31cfab115e760cf38a2093159cd47e6a8e7
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>