Add the support of the new PCM sync_stop ops in ASoC component.
It's optional and can be NULL unless you need the sync operation.
Acked-by: NMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20191121190709.29121-3-tiwai@suse.deSigned-off-by: NTakashi Iwai <tiwai@suse.de>