ASoC: SOF: Intel: Set the default firmware library path for IPC4

ASoC: SOF: Intel: Set the default firmware library path for IPC4

The default path for the external firmware libraries are:
intel/avs-lib/<platform>
or
intel/sof-ipc4-lib/<platform>

Signed-off-by: Peter Ujfalusi <[email protected]>
Reviewed-by: Ranjani Sridharan <[email protected]>
Reviewed-by: Pierre-Louis Bossart <[email protected]>
Reviewed-by: Chao Song <[email protected]>
Reviewed-by: Kai Vehmanen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>