irqs_lock is not used, never was.

Remove irqs_lock.

Fixes: 283b6124 ("ASoC: mediatek: implement mediatek common structure")
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20210910094847.3430413-1-bigeasy@linutronix.de


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