ASoC: max98357a: Drop pointless include

This driver is already using solely GPIO descriptors and
do not need to include the legacy header <linux/gpio.h>.
Drop it.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230911-descriptors-asoc-max-v2-2-b9d793fb768e@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/max98357a.c

@@ -8,7 +8,6 @@
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/err.h>
-#include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/kernel.h>
 #include <linux/mod_devicetable.h>