83xx: Replace CONFIG_MPC83[0-9]X with MPC83[0-9]x

Use the standard lowercase "x" capitalization that other Freescale
architectures use for CPU defines to prevent confusion and errors

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/include/configs/MPC8313ERDB.h b/include/configs/MPC8313ERDB.h
index f0592a8..2308568 100644
--- a/include/configs/MPC8313ERDB.h
+++ b/include/configs/MPC8313ERDB.h
@@ -31,7 +31,7 @@
  */
 #define CONFIG_E300		1
 #define CONFIG_MPC83xx		1
-#define CONFIG_MPC831X		1
+#define CONFIG_MPC831x		1
 #define CONFIG_MPC8313		1
 #define CONFIG_MPC8313ERDB	1