ASoC: Intel: sof_sdw: use .controls/.widgets to add controls/widgets

ASoC: Intel: sof_sdw: use .controls/.widgets to add controls/widgets

sof_sdw_rtd_init() will add the controls and widgets if we set them in
the codec_info. Move the additions from .rtd_init callback to
sof_sdw_rtd_init().

Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20240509163418.67746-17-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>