i.MX: ipufb: add const to fb_videomode declarations

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
diff --git a/board/freescale/mx53loco/mx53loco.c b/board/freescale/mx53loco/mx53loco.c
index 20569a5..a11e883 100644
--- a/board/freescale/mx53loco/mx53loco.c
+++ b/board/freescale/mx53loco/mx53loco.c
@@ -412,7 +412,7 @@
 		printf("CPU:   Switch DDR clock to 400MHz failed\n");
 }
 
-static struct fb_videomode claa_wvga = {
+static struct fb_videomode const claa_wvga = {
 	.name		= "CLAA07LC0ACW",
 	.refresh	= 57,
 	.xres		= 800,