drm/i915: Update ring->dispatch_execbuffer() to take a request structure

Updated the various ring->dispatch_execbuffer() implementations to take a
request instead of a ring.

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>