i.MX3: introduce clock API

This patch introduces the clock API for for arch-mxc

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

diff --git a/include/asm-arm/arch-mxc/common.h b/include/asm-arm/arch-mxc/common.h
index 23b4350..c6d4aa3 100644
--- a/include/asm-arm/arch-mxc/common.h
+++ b/include/asm-arm/arch-mxc/common.h
@@ -16,5 +16,6 @@
 extern void mxc_map_io(void);
 extern void mxc_init_irq(void);
 extern struct sys_timer mxc_timer;
+extern int mxc_clocks_init(unsigned long fref);
 
 #endif