ASoC: Intel: sof_sdw: fix signed/unsigned warning

Sparse throws the following warning:

sound/soc/intel/boards/sof_sdw.c:796:31: error: incorrect type in argument 6 (different signedness)
sound/soc/intel/boards/sof_sdw.c:796:31:    expected int *group_id
sound/soc/intel/boards/sof_sdw.c:796:31:    got unsigned int *

The group_id cannot be negative, use unsigned int.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Paul Olaru <paul.olaru@oss.nxp.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Link: https://lore.kernel.org/r/20210621194057.21711-8-pierre-louis.bossart@linux.intel.com


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