ASoC: SOF: loader: load_firmware callback is mandatory, treat it like that

Since the load_firmware callback in snd_sof_dsp_ops is mandatory and it
is tested during probe.

Move the snd_sof_load_firmware() wrapper to ops.h as inline and drop the
check of sof_ops(sdev)->load_firmware

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20210914125356.19828-1-peter.ujfalusi@linux.intel.com


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