ASoC: cirrus: edb93xx: Drop legacy include

ASoC: cirrus: edb93xx: Drop legacy include

This driver includes the legacy GPIO API <linux/gpio.h> but
does not use any symbols from it.

Drop the include.

Reviewed-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Link: https://patchwork.kernel.org/project/alsa-devel/patch/20231122-ep93xx-v5-38-d59a76d5df29@maquefel.me/
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20231201-descriptors-sound-cirrus-v2-7-ee9f9d4655eb@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>