drm/i915 Update Gen8 golden context batch buffer

The file drivers/gpu/drm/i915/intel_renderstate_gen8.c is
updated to the version created by IGT null_state_gen

Signed-off-by: Armin Reese <armin.c.reese@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>