remove MS_* which can not be combined with current kernel code

remove MS_* which can not be combined with current kernel code

MS_BIND|MS_MOVE can not be combined:
  do_mount()
    else if (flags & MS_BIND)
      do_loopback(&path, dev_name, flags & MS_REC);
    [...]
    else if (flags & MS_MOVE)
      do_move_mount(&path, dev_name);

MS_REMOUNT|MS_UNBINDABLE can not be combined:
  do_mount()
    if (flags & MS_REMOUNT)
      do_remount(&path, flags & ~MS_REMOUNT, mnt_flags, data_page);
    [...]
    else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
      do_change_type(&path, flags);