ASoC: SOF: Intel/ipc4: Support for low power playback

Merge series from Peter Ujfalusi <peter.ujfalusi@linux.intel.com>:

The following series will enable the the Low Power Audio (LPA)
playback on Intel platforms when using IPC4.

The support is closely follows how IPC3 supports similar use case.

All depending patches are upstream and our CI have been testing
this feature for some time without issues.