ASoC: rt5514-spi: Drop GPIO include

This driver include the GPIO legacy header <linux/gpio.h yet
doesn't use symbols from it. Drop the include.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230812-descriptors-asoc-v1-8-eb4dca1f68af@linaro.org


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