ASoC: SOF: pci: No need to cast second time to save the desc

ASoC: SOF: pci: No need to cast second time to save the desc

At the start of the function we already have the desc, no need to cast it
again from pci_id->driver_data to save it to sof_pdata.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20210521092804.3721324-3-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>