ASoC: SOF: Intel: hda-dai: Drop misleading comment regarding dma_data

The comment in hda_link_dma_hw_params() is no longer valid as the dma_data
is set to NULL at system suspend as well.

Instead of rewording the comment to state the obvious: try to take the
hext_stream from the dma_data and if it is not set then assign a new one
and store it as dma_data.

Signed-off-by: Peter Ujfalusi <[email protected]>
Reviewed-by: Pierre-Louis Bossart <[email protected]>
Reviewed-by: Rander Wang <[email protected]>
Reviewed-by: Ranjani Sridharan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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