ASoC: SOF: Intel: hda-mlink: add helper to check cmdsync

This helper is an optimization where sync_go is only called when the
cmdsync field is actually set to a non-zero value.

Since this is also only used by SoundWire for now, only expose the
_unlocked version.

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

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