powerpc/83xx/km: added missing enable of application buffer

Enabled application buffers in uboot to allow application chipselect
access in uboot.

Signed-off-by: Stefan Bigler <stefan.bigler@keymile.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/board/keymile/km83xx/km83xx.c b/board/keymile/km83xx/km83xx.c
index 1043ccd..a889750 100644
--- a/board/keymile/km83xx/km83xx.c
+++ b/board/keymile/km83xx/km83xx.c
@@ -173,6 +173,8 @@
 	setbits_8(&base->pgy_eth, 0x01);
 	/* enable the Unit LED (green) */
 	setbits_8(&base->oprth, WRL_BOOT);
+	/* enable Application Buffer */
+	setbits_8(&base->oprtl, OPRTL_XBUFENA);
 
 #if defined(CONFIG_SUVD3)
 	/* configure UPMA for APP1 */