soundwire: cadence: enable NORMAL operation in cdns_init()

Follow recommended programming sequences, this needs to be enabled
before the reset sequence.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200317163329.25501-13-pierre-louis.bossart@linux.intel.com


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