tools headers UAPI: Sync drm/i915_drm.h with the kernel sources

To pick the changes in:

  b65a948 ("drm/i915/userptr: Probe existence of backing struct pages upon creation")
  ee242ca ("drm/i915/guc: Implement GuC priority management")
  81340cf ("drm/i915/uapi: reject set_domain for discrete")
  7961c5b ("drm/i915: Add TTM offset argument to mmap.")
  aef7b67 ("drm/i915/uapi: convert drm_i915_gem_userptr to kernel doc")
  e7737b6 ("drm/i915/uapi: reject caching ioctls for discrete")
  3aa8c57 ("drm/i915/uapi: convert drm_i915_gem_set_domain to kernel doc")
  289f5a7 ("drm/i915/uapi: convert drm_i915_gem_caching to kernel doc")
  4a766ae ("drm/i915: Drop the CONTEXT_CLONE API (v2)")
  6ff6d61 ("drm/i915: Drop I915_CONTEXT_PARAM_NO_ZEROMAP")
  fe4751c ("drm/i915: Drop I915_CONTEXT_PARAM_RINGSIZE")
  5777295 ("drm/i915: Document the Virtual Engine uAPI")
  c649432 ("drm/i915: Fix busy ioctl commentary")

That doesn't result in any changes to tooling as no new ioctl were
added (at least not perceived by tools/perf/trace/beauty/drm_ioctl.sh).

Addressing this perf build warning:

  Warning: Kernel ABI header at 'tools/include/uapi/drm/i915_drm.h' differs from latest version at 'include/uapi/drm/i915_drm.h'
  diff -u tools/include/uapi/drm/i915_drm.h include/uapi/drm/i915_drm.h

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jason Ekstrand <jason@jlekstrand.net>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Author: acmel