mpc83xx: make dtb basename file references equal those of linux

the dts file basenames were updated in linux - this helps avoid
inadvertently loading any old dtbs laying around.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/include/configs/MPC832XEMDS.h b/include/configs/MPC832XEMDS.h
index 702b073..f32c4f7 100644
--- a/include/configs/MPC832XEMDS.h
+++ b/include/configs/MPC832XEMDS.h
@@ -583,7 +583,7 @@
    "ramdiskaddr=1000000\0"						\
    "ramdiskfile=ramfs.83xx\0"						\
    "fdtaddr=400000\0"							\
-   "fdtfile=mpc832xemds.dtb\0"						\
+   "fdtfile=mpc832x_mds.dtb\0"						\
    ""
 
 #define CONFIG_NFSBOOTCOMMAND						\