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/SIMPC8313.h b/include/configs/SIMPC8313.h
index 995f904..72fe115 100644
--- a/include/configs/SIMPC8313.h
+++ b/include/configs/SIMPC8313.h
@@ -33,7 +33,7 @@
 
 #define CONFIG_E300			1
 #define CONFIG_MPC83xx			1
-#define CONFIG_MPC831X			1
+#define CONFIG_MPC831x			1
 #define CONFIG_MPC8313			1
 
 #define CONFIG_PCI