ASoC: intel: sof_sdw: Rename codec_idx to codec_dlc_index

ASoC: intel: sof_sdw: Rename codec_idx to codec_dlc_index

Having two local variables called codec_idx and codec_index, that refer
to different things is a little confusing. Rename codec_idx to
codec_dlc_index to indicate it points into the dai_link_component array.

Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20230731214257.444605-11-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>