ASoC: SOF: topology: dynamically allocate and store DAI widget->private

ASoC: SOF: topology: dynamically allocate and store DAI widget->private

For dspless mode, we need to allocate and store an 'sdai'
structure. The existing code allocate the data on the stack and does
not set the widget->private pointer.

This minor change should not have any impact on existing DAIs, even
when the DSP is used.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://msgid.link/r/20240213101247.28887-10-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>