i915_drm_local.h is for temporary local addition of defines before KMD is
merged upstream and defines replaced with it. We have similar local defines
requirement for xe as well for some cases. So for common use move
i915_drm_local.h to drm-uapi-experimental/ and rename it to intel_drm_local.h

V4(MAuld)
  - Update copyright content
V2(MAuld)
  - Remove include as it is empty now
  - Add details in commit message

Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Tejas Upadhyay <tejas.upadhyay@intel.com>