According to hardware spec and PMC FW requirement, the DSP must be
in D3 state before entering S5. Define the shutdown function to use
snd_sof_suspend as shutdown callback to make sure DSP is in D3 state.

Fixes: 44a4cfad ("ASoC: SOF: Intel: tgl: do thorough remove at .shutdown() callback")
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Pan Xiuli <xiuli.pan@linux.intel.com>
Signed-off-by: Libin Yang <libin.yang@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210322163728.16616-5-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>