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/vf610twr.h b/include/configs/vf610twr.h
index 0e0b3a7..d10b88f 100644
--- a/include/configs/vf610twr.h
+++ b/include/configs/vf610twr.h
@@ -21,7 +21,7 @@
 
 #define CFG_SYS_FSL_ESDHC_ADDR	0
 
-#define CONFIG_FEC_MXC_PHYADDR          0
+#define CFG_FEC_MXC_PHYADDR          0
 
 /* I2C Configs */