ARM: 8940/1: ftrace: remove mcount(),ftrace_caller_old() and ftrace_call_old()

Commit d3c61619568c ("ARM: 8788/1: ftrace: remove old mcount support")
removed the old mcount support, but forget to remove these three
declarations. This patch removes them.

Signed-off-by: Jisheng Zhang <[e-mail]>
Acked-by: Steven Rostedt (VMware) <[e-mail]>
Signed-off-by: Russell King <[e-mail]>

arch/arm/include/asm/ftrace.h

···
 #define MCOUNT_INSN_SIZE	4 /* sizeof mcount call */
 
 #ifndef __ASSEMBLY__
-extern void mcount(void);
 extern void __gnu_mcount_nc(void);
 
 #ifdef CONFIG_DYNAMIC_FTRACE
···
 	/* With Thumb-2, the recorded addresses have the lsb set */
 	return addr & ~1;
 }
-
-extern void ftrace_caller_old(void);
-extern void ftrace_call_old(void);
 #endif
 
 #endif