[ARM] Add comments marking in-use ptrace numbers

#ifndef __ASM_ARM_PTRACE_H

#define __ASM_ARM_PTRACE_H

#define PTRACE_GETREGS		12

#define PTRACE_SETREGS		13

#define PTRACE_GETFPREGS	14

#define PTRACE_SETFPREGS	15

/* PTRACE_ATTACH is 16 */

/* PTRACE_DETACH is 17 */

#define PTRACE_GETWMMXREGS	18

#define PTRACE_SETWMMXREGS	19

/* 20 is unused */

#define PTRACE_OLDSETOPTIONS	21

#define PTRACE_GET_THREAD_AREA	22

#define PTRACE_SET_SYSCALL	23

/* PTRACE_SYSCALL is 24 */

#define PTRACE_GETCRUNCHREGS	25

#define PTRACE_SETCRUNCHREGS	26