ASoC: SOF: Add ops_free

Add the ops_free callback in struct sof_dev_desc.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20220609032643.916882-18-ranjani.sridharan@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>