ASoC: Intel: KeemBay: Fix warning potential ! vs ~ typo

To set platform in slave mode setting the MASTER_MODE bit is not needed.
Removing !MASTER_MODE conditional to avoid potential errors and warning.

Signed-off-by: Michael Sit Wei Hong <michael.wei.hong.sit@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200904020904.19577-1-michael.wei.hong.sit@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>