After recent consolidations the Nomadik <plat/gpio.h> is entirely
superfluous, so get rid of it.
Reported-by: NRussell King <linux@arm.linux.org.uk>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>