rename CFG_ macros to CONFIG_SYS

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/cpu/microblaze/exception.c b/cpu/microblaze/exception.c
index d76b05a..0365de3 100644
--- a/cpu/microblaze/exception.c
+++ b/cpu/microblaze/exception.c
@@ -65,7 +65,7 @@
 	hang ();
 }
 
-#ifdef CFG_USR_EXCEP
+#ifdef CONFIG_SYS_USR_EXCEP
 void _exception_handler (void)
 {
 	puts ("User vector_exception\n");