global: Migrate CONFIG_FEC_ENET_DEV to CFG

Perform a simple rename of CONFIG_FEC_ENET_DEV to CFG_FEC_ENET_DEV

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/dart_6ul.h b/include/configs/dart_6ul.h
index 323703a..c2ed9c7 100644
--- a/include/configs/dart_6ul.h
+++ b/include/configs/dart_6ul.h
@@ -18,7 +18,7 @@
 #endif
 
 #ifdef CONFIG_CMD_NET
-#define CONFIG_FEC_ENET_DEV		0
+#define CFG_FEC_ENET_DEV		0
 #endif
 
 /* Environment settings */