rename CFG_ macros to CONFIG_SYS

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/cpu/mips/au1x00_eth.c b/cpu/mips/au1x00_eth.c
index d0cf8e0..8ddc06a 100644
--- a/cpu/mips/au1x00_eth.c
+++ b/cpu/mips/au1x00_eth.c
@@ -23,7 +23,7 @@
  */
 #include <config.h>
 
-#if defined(CFG_DISCOVER_PHY)
+#if defined(CONFIG_SYS_DISCOVER_PHY)
 #error "PHY not supported yet"
 /* We just assume that we are running 100FD for now */
 /* We all use switches, right? ;-) */