Revert "slim_ngd: fix cherry-pick mistake"

This reverts commit 5c0f7b839c381d67cbfc31692ce743d514f4d581.
Revert "slim_ngd: Ensure device state consistency with runtime-pm during SSR"

This reverts commit 2934ab0d08d140e111986ce77197b093f198c6ef.
Revert "slim_ngd: Use DSP before-shutdown notification for DSP SSR"

This reverts commit a14c54a3afd8a35584c46a37b7530a8cdabfd2c2.