drm/vmwgfx: Add and make use of a header for surface size calculation.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Dmitry Torokhov <dtor@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --cc drivers/gpu/drm/vmwgfx/svga3d_surfacedefs.h
Simple merge

diff --cc drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
Simple merge