tools headers: Synchronize prctl.h ABI header

To pick up changes from:

  $ git log --oneline -2 -i include/uapi/linux/prctl.h
  356e4bff prctl: Add force disable speculation
  b617cfc8 prctl: Add speculation control prctls

  $ tools/perf/trace/beauty/prctl_option.sh > before.c
  $ cp include/uapi/linux/prctl.h tools/include/uapi/linux/prctl.h
  $ tools/perf/trace/beauty/prctl_option.sh > after.c
  $ diff -u before.c after.c
  --- before.c	2018-06-01 10:39:53.834073962 -0300
  +++ after.c	2018-06-01 10:42:11.307985394 -0300
  @@ -35,6 +35,8 @@
          [42] = "GET_THP_DISABLE",
          [45] = "SET_FP_MODE",
          [46] = "GET_FP_MODE",
  +       [52] = "GET_SPECULATION_CTRL",
  +       [53] = "SET_SPECULATION_CTRL",
   };
   static const char *prctl_set_mm_options[] = {
 	  [1] = "START_CODE",
  $

This will be used by 'perf trace' to show these strings when beautifying
the prctl syscall args. At some point we'll be able to say something
like:

	'perf trace --all-cpus -e prctl(option=*SPEC*)'

To filter by arg by name.

  This silences this warning when building tools/perf:

    Warning: Kernel ABI header at 'tools/include/uapi/linux/prctl.h' differs from latest version at 'include/uapi/linux/prctl.h'

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-zztsptwhc264r8wg44tqh5gp@git.kernel.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>