ia64: move function declaration, ia64_cpu_local_tick() from .c to .h

eliminate the function declaration ia64_cpu_local_tick() in
process.c by defining in arch/ia64/include/asm/timex.h
The same function will be used in a different .c file later.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/include/asm/timex.h b/arch/ia64/include/asm/timex.h
index 05a6baf..4e03cfe 100644
--- a/arch/ia64/include/asm/timex.h
+++ b/arch/ia64/include/asm/timex.h
@@ -39,4 +39,6 @@
 	return ret;
 }
 
+extern void ia64_cpu_local_tick (void);
+
 #endif /* _ASM_IA64_TIMEX_H */