drm/i915: Update render_state_init() to take a request structure

Updated the two render_state_init() functions to take a request pointer instead
of a ring. This removes their reliance on the OLR.

v2: Rebased to newer tree.

For: VIZ-5115
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Tomas Elf <tomas.elf@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>