sys/fanotify.h: add new FAN_* macros from linux v5.9

sys/fanotify.h: add new FAN_* macros from linux v5.9

Update fanotify.h, see

  linux commit 929943b38daf817f2e6d303ea04401651fc3bc05
  fanotify: add support for FAN_REPORT_NAME

  linux commit 83b7a59896dd24015a34b7f00027f0ff3747972f
  fanotify: add basic support for FAN_REPORT_DIR_FID

  linux commit 08b95c338e0c5a96e47f4ca314ea1e7580ecb5d7
  fanotify: remove event FAN_DIR_MODIFY

FAN_DIR_MODIFY that was new in v5.7 is now removed from linux uapi,
but kept in musl, so we don't break api, linux cannot reuse the
value anyway.