[intel] Clean up references to screen buffer metrics.

The screen wide info such as pitch and cpp are obsoleted by the FBO
changes, so clean up the last few references to those, except for
setting up the legacy screen regions.

src/mesa/drivers/dri/intel/intel_regions.c

@@ -394,8 +394,8 @@ intel_recreate_static(struct intel_context *intel,
       region->refcount = 1;
    }
 
-   region->cpp = intelScreen->cpp;
-   region->pitch = region_desc->pitch / intelScreen->cpp;
+   region->cpp = intel->ctx.Visual.rgbBits / 8;
+   region->pitch = intelScreen->pitch;
    region->height = intelScreen->height;     /* needed? */
    region->tiled = region_desc->tiled;
 
@@ -408,7 +408,7 @@ intel_recreate_static(struct intel_context *intel,
       region->buffer = dri_bo_alloc_static(intel->bufmgr,
 					   name,
 					   region_desc->offset,
-					   region_desc->pitch *
+					   intelScreen->pitch *
 					   intelScreen->height,
 					   region_desc->map,
 					   DRM_BO_FLAG_MEM_TT);