ASoC: Intel: ehl_rt5660: do not check common_hdmi_codec_drv

The variable common_hdmi_codec_drv is always true on SOF platform so
we could remove the reference in machine driver.

Signed-off-by: Brent Lu <brent.lu@intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://patch.msgid.link/20240912120308.134762-4-yung-chuan.liao@linux.intel.com


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