arm64: mm: Make show_pte() a static function

show_pte() doesn't have any external callers, so make it static.

Signed-off-by: Will Deacon <will.deacon@arm.com>

arch/arm64/include/asm/system_misc.h

@@ -41,7 +41,6 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
 			   int sig, int code, const char *name);
 
 struct mm_struct;
-extern void show_pte(unsigned long addr);
 extern void __show_regs(struct pt_regs *);
 
 extern void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);