ASoC: SOF: change comp_dai to a pointer in struct snd_sof_dai

ASoC: SOF: change comp_dai to a pointer in struct snd_sof_dai

This will avoid having to add the extended data for DAI components during
sof_widget_setup() as an extra step.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220307181111.49392-11-ranjani.sridharan@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>