MXC: add convenience function to register platform devices

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

diff --git a/arch/arm/plat-mxc/include/mach/common.h b/arch/arm/plat-mxc/include/mach/common.h
index a6d2e24..6350287 100644
--- a/arch/arm/plat-mxc/include/mach/common.h
+++ b/arch/arm/plat-mxc/include/mach/common.h
@@ -11,10 +11,13 @@
 #ifndef __ASM_ARCH_MXC_COMMON_H__
 #define __ASM_ARCH_MXC_COMMON_H__
 
+struct platform_device;
+
 extern void mxc_map_io(void);
 extern void mxc_init_irq(void);
 extern void mxc_timer_init(const char *clk_timer);
 extern int mxc_clocks_init(unsigned long fref);
 extern int mxc_register_gpios(void);
+extern int mxc_register_device(struct platform_device *pdev, void *data);
 
 #endif