drm/i915: Pass rotation_info to intel_rotate_fb_obj_pages()

intel_rotate_fb_obj_pages() doens't need the entire gtt view, just the
rotation info suffices.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1453316739-13296-4-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>