ASoC: SDCA: Use auto-cleanup for firmware loading

ASoC: SDCA: Use auto-cleanup for firmware loading

Simplify the code to manage the firmware loading with __free(firmware)
auto-cleanup.

Only the code refactoring, no functional changes.

Cc: Charles Keepax <ckeepax@opensource.cirrus.com>
Cc: Maciej Strozek <mstrozek@opensource.cirrus.com>
Cc: Bard Liao <yung-chuan.liao@linux.intel.com>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Tested-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20260806140006.1412298-31-tiwai@suse.de
Signed-off-by: Mark Brown <broonie@kernel.org>