soundwire: cadence_master: fix register definition for SLAVE_STATE

wrong prefix and wrong macro.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190725234032.21152-14-pierre-louis.bossart@linux.intel.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>