ASoC: SOF: Intel: hda-mlink: add helper to program SoundWire PCMSyCM registers

These registers enable the HDaudio DMA hardware to split/merge data
from different PDIs, possibly on different links.

This capability exists for all types of HDaudio extended links, but
for now is only required for SoundWire. In the SSP/DMIC case, the IP
is programmed by the DSP firmware.

Signed-off-by: Pierre-Louis Bossart <[email protected]
Reviewed-by: Bard Liao <[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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