ASoC: SOF: Intel: define and set power_down_dsp op for HDA platforms

hda_power_down_dsp is set for power_down_dsp op for all HDA platforms.

Signed-off-by: Fred Oh <fred.oh@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20220922213644.666315-3-ranjani.sridharan@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>