ASoC: cs35l32: Drop legacy include

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

Drop the include.
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-v2-1-ee9f9d4655eb@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cs35l32.c

@@ -13,7 +13,6 @@
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/i2c.h>
-#include <linux/gpio.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>