rename CFG_ macros to CONFIG_SYS

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/doc/README.JFFS2_NAND b/doc/README.JFFS2_NAND
index a836d53..2b3326b 100644
--- a/doc/README.JFFS2_NAND
+++ b/doc/README.JFFS2_NAND
@@ -13,7 +13,7 @@
 #define CONFIG_JFFS2_NAND_SIZE 2*1024*1024	/* size of jffs2 partition */
 
 If more than a single partition is desired, the user can define a
-CFG_JFFS_CUSTOM_PART macro and implement a
+CONFIG_SYS_JFFS_CUSTOM_PART macro and implement a
 
 	struct part_info* jffs2_part_info(int part_num)