global: Migrate CONFIG_FEC_MXC_PHYADDR to CFG

Perform a simple rename of CONFIG_FEC_MXC_PHYADDR to CFG_FEC_MXC_PHYADDR

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/nitrogen6x.h b/include/configs/nitrogen6x.h
index 496a316..aca15be 100644
--- a/include/configs/nitrogen6x.h
+++ b/include/configs/nitrogen6x.h
@@ -18,7 +18,7 @@
 #define CFG_SYS_FSL_USDHC_NUM       2
 
 #define IMX_FEC_BASE			ENET_BASE_ADDR
-#define CONFIG_FEC_MXC_PHYADDR		6
+#define CFG_FEC_MXC_PHYADDR		6
 
 /* USB Configs */
 #define CONFIG_MXC_USB_PORTSC	(PORT_PTS_UTMI | PORT_PTS_PTW)