ASoC: SDCA: Factor out a helper to find SDCA IRQ data

ASoC: SDCA: Factor out a helper to find SDCA IRQ data

Add a helper function to locate the sdca_interrupt structure for a given
SDCA IRQ, this makes the code a little more readable and will facilitate
some additions in the future.

Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20251020155512.353774-8-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>