i965: Make Gen6+ renderbuffer surface updates not depend on NEW_COLOR.

NEW_COLOR is only needed on Gen4-5 as brw_update_renderbuffer_surfaces
only uses ctx->Color when intel->gen < 6.

This should reduce unnecessary state updates.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>

src/mesa/drivers/dri/i965/brw_state.h

 extern const struct brw_tracked_state gen6_color_calc_state;
 extern const struct brw_tracked_state gen6_depth_stencil_state;
 extern const struct brw_tracked_state gen6_gs_state;
+extern const struct brw_tracked_state gen6_renderbuffer_surfaces;
 extern const struct brw_tracked_state gen6_sampler_state;
 extern const struct brw_tracked_state gen6_scissor_state;
 extern const struct brw_tracked_state gen6_sf_state;

src/mesa/drivers/dri/i965/brw_state_upload.c

     */
    &brw_vs_pull_constants,
    &brw_wm_pull_constants,
-   &brw_renderbuffer_surfaces,
+   &gen6_renderbuffer_surfaces,
    &brw_texture_surfaces,
    &brw_binding_table,
 
     */
    &brw_vs_pull_constants,
    &brw_wm_pull_constants,
-   &brw_renderbuffer_surfaces,
+   &gen6_renderbuffer_surfaces,
    &brw_texture_surfaces,
    &brw_binding_table,
 

src/mesa/drivers/dri/i965/brw_wm_surface_state.c

    .emit = brw_update_renderbuffer_surfaces,
 };
 
+const struct brw_tracked_state gen6_renderbuffer_surfaces = {
+   .dirty = {
+      .mesa = _NEW_BUFFERS,
+      .brw = BRW_NEW_BATCH,
+      .cache = 0
+   },
+   .emit = brw_update_renderbuffer_surfaces,
+};
+
 /**
  * Construct SURFACE_STATE objects for enabled textures.
  */