ASoC: SOF: Intel: hda-mlink: initialize instance_offset member

We defined the values but never initialized it for SoundWire/SSP, fix
this miss.

A Fixes: tag is not provided as instance_offset was not used so far,
so nothing was really broken. This patch is only required for the
SoundWire support in the following patch.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20230512174611.84372-6-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>