video: Avoid setting global_data fb_base in video setup

This field is not used, so don't set it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/video-uclass.c b/drivers/video/video-uclass.c
index ef780a6..41bb764 100644
--- a/drivers/video/video-uclass.c
+++ b/drivers/video/video-uclass.c
@@ -145,7 +145,6 @@
 		*addrp -= CONFIG_VAL(VIDEO_PCI_DEFAULT_FB_SIZE);
 
 	gd->video_bottom = *addrp;
-	gd->fb_base = *addrp;
 	debug("Video frame buffers from %lx to %lx\n", gd->video_bottom,
 	      gd->video_top);