[ARM] Kirkwood: WPS button keycode mapping

Commit "Input: add KEY_WPS_BUTTON definition"
added a generic keycode for WPS button.
Let's use it, instead of "F1" mapping.
Signed-off-by: NChristian Lamparter <chunkeey@googlemail.com>
Signed-off-by: NNicolas Pitre <nico@marvell.com>

arch/arm/mach-kirkwood/mv88f6281gtw_ge-setup.c

@@ -74,9 +74,9 @@ static struct gpio_keys_button mv88f6281gtw_ge_button_pins[] = {
 		.desc		= "SWR Button",
 		.active_low	= 1,
 	}, {
-		.code		= KEY_F1,
+		.code		= KEY_WPS_BUTTON,
 		.gpio		= 46,
-		.desc		= "WPS Button(F1)",
+		.desc		= "WPS Button",
 		.active_low	= 1,
 	},
 };