83xx: Replace CONFIG_MPC83XX with CONFIG_MPC83xx

Use the standard lowercase "xx" 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/doc/README.mpc8360emds b/doc/README.mpc8360emds
index 7c841ce..d65a2a4 100644
--- a/doc/README.mpc8360emds
+++ b/doc/README.mpc8360emds
@@ -81,7 +81,7 @@
 
 	include/configs/MPC8360EMDS.h
 
-    CONFIG_MPC83XX	    MPC83xx family for both MPC8349 and MPC8360
+    CONFIG_MPC83xx	    MPC83xx family for both MPC8349 and MPC8360
     CONFIG_MPC8360	    MPC8360 specific
     CONFIG_MPC8360EMDS	    MPC8360EMDS board specific