In cases of multiple Masters in a stream, synchronization
between multiple Master(s) is achieved by performing bank switch
together and using Master methods.

Add sdw_ml_bank_switch() to wait for completion of bank switch.
Signed-off-by: NSanyog Kale <sanyog.r.kale@intel.com>
Signed-off-by: NShreyas NC <shreyas.nc@intel.com>
Acked-by: NPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: NVinod Koul <vkoul@kernel.org>