cpu/allwinner/a10: Add definitions for in/output GPIO functions

Change-Id: I2b857d3b4c01e39c62e54f753e400e6049f1dbc9
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/4598
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: David Hendricks <dhendrix@chromium.org>

src/cpu/allwinner/a10/gpio.h

@@ -23,6 +23,10 @@
 #define GPI			8
 #define GPS			9
 
+/* GPIO pad functions valid for all pins */
+#define GPIO_PIN_FUNC_INPUT	0
+#define GPIO_PIN_FUNC_OUTPUT	1
+
 struct a10_gpio_port {
 	u32 cfg[4];
 	u32 dat;