ALSA: hda: cs35l41: Constify regmap_irq_chip

Static 'struct regmap_irq_chip' is not modified so can be changed to
const for more safety.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20250528194402.567062-2-krzysztof.kozlowski@linaro.org


Signed-off-by: Takashi Iwai <tiwai@suse.de>