ASoC: sam9g20_wm8731: remove useless mach/gpio.h

This include file is about to disapear. In addition it is
useless for this code. So it is time to remove it.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Mark Brown <broonie@linaro.org>
1 file changed