ASoC: rt1308: Drop GPIO includes

This driver include two GPIO legacy headers yet doesn't use
symbols from any of them. Drop the includes.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230812-descriptors-asoc-v1-7-eb4dca1f68af@linaro.org


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