[MIPS] Remove prototype for non-existing function.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/mm/tlb-r4k.c

@@ -413,7 +413,6 @@ out:
 	return ret;
 }
 
-extern void __init sanitize_tlb_entries(void);
 static void __init probe_tlb(unsigned long config)
 {
 	struct cpuinfo_mips *c = &current_cpu_data;