ASoC: rt5645: Drop legacy GPIO include

This driver include the GPIO legacy header <linux/gpio.h yet
doesn't use symbols from it. It is using the new consumer
include <linux/gpio/consumer.h already. Drop the surplus
include.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230812-descriptors-asoc-v1-10-eb4dca1f68af@linaro.org


Signed-off-by: Mark Brown <broonie@kernel.org>