ASoC: rt5677-spi: Drop unused GPIO include

This SPI driver does not use the legacy GPIO header so
just delete it.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5677-spi.c

@@ -18,7 +18,6 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/slab.h>
-#include <linux/gpio.h>
 #include <linux/sched.h>
 #include <linux/uaccess.h>
 #include <linux/regulator/consumer.h>