tools headers UAPI: Update tools's copy of drm.h headers

Picking the changes from:

  455e00f1 ("drm: Add getfb2 ioctl")

Silencing these perf build warnings:

  Warning: Kernel ABI header at 'tools/include/uapi/drm/drm.h' differs from latest version at 'include/uapi/drm/drm.h'
  diff -u tools/include/uapi/drm/drm.h include/uapi/drm/drm.h

Now 'perf trace' and other code that might use the
tools/perf/trace/beauty autogenerated tables will be able to translate
this new ioctl code into a string:

  $ tools/perf/trace/beauty/drm_ioctl.sh > before
  $ cp include/uapi/drm/drm.h tools/include/uapi/drm/drm.h
  $ tools/perf/trace/beauty/drm_ioctl.sh > after
  $ diff -u before after
  --- before	2020-04-14 09:28:45.461821077 -0300
  +++ after	2020-04-14 09:28:53.594782685 -0300
  @@ -107,6 +107,7 @@
   	[0xCB] = "SYNCOBJ_QUERY",
   	[0xCC] = "SYNCOBJ_TRANSFER",
   	[0xCD] = "SYNCOBJ_TIMELINE_SIGNAL",
  +	[0xCE] = "MODE_GETFB2",
   	[DRM_COMMAND_BASE + 0x00] = "I915_INIT",
   	[DRM_COMMAND_BASE + 0x01] = "I915_FLUSH",
   	[DRM_COMMAND_BASE + 0x02] = "I915_FLIP",
  $

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Daniel Stone <daniels@collabora.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Lyude Paul <lyude@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>