ASoC: SOF: compress: Introduce sof_compr_stream

ASoC: SOF: compress: Introduce sof_compr_stream

This will keep SOF compress stream private data. So far
we used snd_compr_tstamp to hold the private data but this
is no longer enough as we need to hold other info like
number of channels or sample bytes.

Reviewed-by: Paul Olaru <paul.olaru@oss.nxp.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Link: https://lore.kernel.org/r/20220817080529.10864-3-daniel.baluta@oss.nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>