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/MPC837XERDB.h b/include/configs/MPC837XERDB.h
index 2da4f29..1964946 100644
--- a/include/configs/MPC837XERDB.h
+++ b/include/configs/MPC837XERDB.h
@@ -545,7 +545,7 @@
 #define CONFIG_RAMDISKFILE	rootfs.ext2.gz.uboot
 #define CONFIG_BOOTFILE		uImage
 #define CONFIG_UBOOTPATH	u-boot.bin	/* U-Boot image on TFTP server */
-#define CONFIG_FDTFILE		mpc837x_rdb.dtb
+#define CONFIG_FDTFILE		mpc8379_rdb.dtb
 
 #define CONFIG_LOADADDR		200000	/* default location for tftp and bootm */
 #define CONFIG_BOOTDELAY	-1	/* -1 disables auto-boot */