ASoC: ti: osk5912: Drop unused include

This driver includes the legacy header <linux/gpio.h> but doesn't
use it. Drop the include.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Link: https://lore.kernel.org/r/20230926-descriptors-asoc-ti-v1-5-60cf4f8adbc5@linaro.org


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