ASoC: SOF: IPC4: Add FW loader ops

Define and add the FW loader ops for IPC4. Also, introduce a new
structure, struct sof_ipc4_private_data that will be used to define some
IPC4-sepcific data.

Co-developed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Rander Wang <rander.wang@intel.com>
Co-developed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Co-developed-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20220511171648.1622993-5-ranjani.sridharan@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>