arm, kirkwood: added kw_gpio_set_valid() in gpio.h

Signed-off-by: Heiko Schocher <hs@denx.de>

include/asm-arm/arch-kirkwood/gpio.h

@@ -37,6 +37,8 @@
 /*
  * Kirkwood-specific GPIO API
  */
+
+void kw_gpio_set_valid(unsigned pin, int mode);
 int kw_gpio_is_valid(unsigned pin, int mode);
 int kw_gpio_direction_input(unsigned pin);
 int kw_gpio_direction_output(unsigned pin, int value);