ASoC: mt8173-max98090: Drop unused include

ASoC: mt8173-max98090: Drop unused include

This driver includes the legacy GPIO header <linux/gpio.h> but
is not using any symbols from it. Drop the include.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20231006-descriptors-asoc-mediatek-v1-3-07fe79f337f5@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>