MX3X: Add Keypad device definition for MX3X arch

This patch adds also the pin definition helpers in iomux-mx3.h

Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-mx3/devices.h b/arch/arm/mach-mx3/devices.h
index b1687ad..2c3c864 100644
--- a/arch/arm/mach-mx3/devices.h
+++ b/arch/arm/mach-mx3/devices.h
@@ -28,3 +28,4 @@
 extern struct platform_device imx_ssi_device1;
 extern struct platform_device imx_wdt_device0;
 extern struct platform_device imx_rtc_device0;
+extern struct platform_device imx_kpp_device;