ASoC: pcm1681: Drop unused include

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

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patch.msgid.link/20250312-pcm-codecs-v1-1-41ffc4f8fc5c@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Linus Walleij

sound/soc/codecs/pcm1681.c

@@ -9,7 +9,6 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
-#include <linux/gpio.h>
 #include <linux/i2c.h>
 #include <linux/regmap.h>
 #include <linux/of.h>