ASoC: SOF: Drop the firmware and fw_offset from snd_sof_pdata

The SOF stack now uses the sdev->basefw to work with the SOF firmware, the
information from plat_data can be dropped.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Chao Song <chao.song@intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20221020121238.18339-7-peter.ujfalusi@linux.intel.com


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