ptp: Document the PTP_CLK_MAGIC ioctl number

Add PTP_CLK_MAGIC to the userspace-api/ioctl/ioctl-number.rst
documentation file.

Fixes: d94ba80 ("ptp: Added a brand new class driver for ptp clocks.")
Signed-off-by: Randy Dunlap <[email protected]>
Cc: Richard Cochran <[email protected]>
Cc: John Stultz <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: rddunlap

Documentation/userspace-api/ioctl/ioctl-number.rst

@@ -104,6 +104,7 @@ Code  Seq#    Include File                                           Comments
 '8'   all                                                            SNP8023 advanced NIC card
                                                                      <mailto:[email protected]>
 ';'   64-7F  linux/vfio.h
+'='   00-3f  uapi/linux/ptp_clock.h                                  <mailto:[email protected]>
 '@'   00-0F  linux/radeonfb.h                                        conflict!
 '@'   00-0F  drivers/video/aty/aty128fb.c                            conflict!
 'A'   00-1F  linux/apm_bios.h                                        conflict!