rename CFG_ macros to CONFIG_SYS

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/cpu/mpc86xx/fdt.c b/cpu/mpc86xx/fdt.c
index 12d9052..1fef94f5 100644
--- a/cpu/mpc86xx/fdt.c
+++ b/cpu/mpc86xx/fdt.c
@@ -28,8 +28,8 @@
 	fdt_fixup_ethernet(blob);
 #endif
 
-#ifdef CFG_NS16550
+#ifdef CONFIG_SYS_NS16550
 	do_fixup_by_compat_u32(blob, "ns16550",
-			       "clock-frequency", CFG_NS16550_CLK, 1);
+			       "clock-frequency", CONFIG_SYS_NS16550_CLK, 1);
 #endif
 }