mx31: add camera device

This adds the camera device based on Guennadi's soc_camera architecture
for the mx31.

The proposed init by Guennadi was removed and must be implemented in the
board init file as it contains a lot of board specific info (memory
size, clock speed).

Signed-off-by: Valentin Longchamp <valentin.longchamp@epfl.ch>
Reviewed-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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 27779c3..475410a 100644
--- a/arch/arm/mach-mx3/devices.h
+++ b/arch/arm/mach-mx3/devices.h
@@ -11,6 +11,7 @@
 extern struct platform_device mxc_i2c_device2;
 extern struct platform_device mx3_ipu;
 extern struct platform_device mx3_fb;
+extern struct platform_device mx3_camera;
 extern struct platform_device mxc_fec_device;
 extern struct platform_device mxcsdhc_device0;
 extern struct platform_device mxcsdhc_device1;