global: Migrate CONFIG_PHY_ID to CFG

Perform a simple rename of CONFIG_PHY_ID to CFG_PHY_ID

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/ethernut5.h b/include/configs/ethernut5.h
index 3fd58d6..182369d 100644
--- a/include/configs/ethernut5.h
+++ b/include/configs/ethernut5.h
@@ -48,7 +48,7 @@
 /* JFFS2 */
 
 /* Ethernet */
-#define CONFIG_PHY_ID			0
+#define CFG_PHY_ID			0
 
 /* MMC */
 #ifdef CONFIG_CMD_MMC