drm/i915/perf: update generated files headers

Lucas submitted a patch to generator script, so just reflecting the
change here.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181023100707.31738-2-lionel.g.landwerlin@intel.com