gpio: do not include <asm/arch/gpio.h> for UniPhier

I implemented a GPIO driver based on Driver Model for the UniPhier
SoC family, but I could not find any good reason why such SoC
specific GPIO headers are needed.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Simon Glass <sjg@chromium.org>

arch/arm/include/asm/gpio.h

+#ifndef CONFIG_ARCH_UNIPHIER
 #include <asm/arch/gpio.h>
+#endif
 #include <asm-generic/gpio.h>