pci: video: Set up the pixel-format field

Add this information to the handoff structure so that it is available to
U-Boot proper. Update bochs and the video handoff.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/bochs.c b/drivers/video/bochs.c
index 00e673a..c34bc23 100644
--- a/drivers/video/bochs.c
+++ b/drivers/video/bochs.c
@@ -64,6 +64,7 @@
 	uc_priv->xsize = xsize;
 	uc_priv->ysize = ysize;
 	uc_priv->bpix = VIDEO_BPP32;
+	uc_priv->format = VIDEO_X8B8G8R8;
 
 	/* setup video mode */
 	bochs_write(mmio, INDEX_ENABLE,  0);