ASoC: wcd9335: Add support in codec to reduce cold start latency

As soundwire is in wcd9335 codec, all soundwire register writes
should go through codec. To reduce the latency of register
writes during device path bringup, add bulk register write
function to write multiple soundwire registers in one
transaction.

Change-Id: I97055d20ef1e7cfb15b41e00183291a10af35b1f
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>