Ask the vga core to update the display.  Will trigger dpy_gfx_resize
if needed.  More complete than just calling dpy_gfx_resize.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit c099e7aa)
Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>