spi: zynq-qspi: Drop GPIO header

This driver does not use any symbols from the legacy GPIO
header so drop the include.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20191030073624.23974-1-linus.walleij@linaro.org


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