ASoC: SOF: ipc4/Intel: Implement split fw library

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

This series implements support for split library loading to comply with the HDA
DMA programming sequence recommendation, which is:
1. DSP side DMA programming and GEN bit set to 1
2. host side DMA programming and RUN bit set to 1

The SOF support for library loading is based on this sequence, backwards
compatibility with older reference firmware is supported (where only the
LOAD_LIBRARY message is supported).