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/imx8mp_evk.h b/include/configs/imx8mp_evk.h
index c6e3b10..1fea5b7 100644
--- a/include/configs/imx8mp_evk.h
+++ b/include/configs/imx8mp_evk.h
@@ -13,7 +13,7 @@
 #define CFG_SYS_UBOOT_BASE	(QSPI0_AMBA_BASE + CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR * 512)
 
 #if defined(CONFIG_CMD_NET)
-#define CONFIG_FEC_MXC_PHYADDR          1
+#define CFG_FEC_MXC_PHYADDR          1
 
 #define PHY_ANEG_TIMEOUT 20000