soundwire: cadence: use dai_runtime_array instead of dma_data

Simplify the code with a Cadence-specific dai_runtime_array, indexed
with dai->id, instead of abusing dma_data.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20221101023521.2384586-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>