xenfb: fix build breakage caused by console cleanup series

Console cleanup series renamed dpy_resize and dpy_update all over the
tree, but hw/xenfb.c was forgotten.  Update it too so it builds again.
Reported-by: NJan Kiszka <jan.kiszka@web.de>
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/xenfb.c

@@ -648,7 +648,7 @@ static void xenfb_guest_copy(struct XenFB *xenfb, int x, int y, int w, int h)
         xen_be_printf(&xenfb->c.xendev, 0, "%s: oops: convert %d -> %d bpp?\n",
                       __FUNCTION__, xenfb->depth, bpp);
 
-    dpy_update(xenfb->c.ds, x, y, w, h);
+    dpy_gfx_update(xenfb->c.ds, x, y, w, h);
 }
 
 #ifdef XENFB_TYPE_REFRESH_PERIOD
@@ -766,7 +766,7 @@ static void xenfb_update(void *opaque)
         xen_be_printf(&xenfb->c.xendev, 1, "update: resizing: %dx%d @ %d bpp%s\n",
                       xenfb->width, xenfb->height, xenfb->depth,
                       is_buffer_shared(xenfb->c.ds->surface) ? " (shared)" : "");
-        dpy_resize(xenfb->c.ds);
+        dpy_gfx_resize(xenfb->c.ds);
         xenfb->up_fullscreen = 1;
     }