tools headers UAPI: Sync sched.h with the kernel

To get the changes in:

  a509a7cd ("sched/uclamp: Extend sched_setattr() to support utilization clamping")
  1d6362fa ("sched/core: Allow sched_setattr() to use the current policy")
  7f192e3c ("fork: add clone3")

And silence this perf build warning:

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

No changes in tools/ due to the above.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Christian Brauner <christian@brauner.io>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Patrick Bellasi <patrick.bellasi@arm.com>
Link: https://lkml.kernel.org/n/tip-mtrpsjrux5hgyr5uf8l1aa46@git.kernel.org


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