ASoC: SOF: Intel: hda: save handle to sdev in sof_intel_hda_stream

Add a snd_sof_dev member to sof_intel_hda_stream. This will be
used to access the snd_sof_dev during link hw_params callback.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>