GCC4.6: Squash warnings in diu.c

diu.c: In function 'diu_set_pixel_clock':
diu.c:77: warning: format '%lu' expects type 'long unsigned int', but argument 2
has type 'u32'

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Mike Frysinger <vapier@gentoo.org>

board/freescale/p1022ds/diu.c

@@ -74,7 +74,7 @@ void diu_set_pixel_clock(unsigned int pixclock)
 	temp = 1000000000 / pixclock;
 	temp *= 1000;
 	pixval = speed_ccb / temp;
-	debug("DIU pixval = %lu\n", pixval);
+	debug("DIU pixval = %u\n", pixval);
 
 	/* Modify PXCLK in GUTS CLKDVDR */
 	temp = in_be32(&gur->clkdvdr) & 0x2000FFFF;