ASoC: fsl: Use auto-cleanup for firmware loading

ASoC: fsl: 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: Shengjiu Wang <shengjiu.wang@gmail.com>
Cc: Xiubo Li <Xiubo.Lee@gmail.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20260806140006.1412298-26-tiwai@suse.de
Signed-off-by: Mark Brown <broonie@kernel.org>