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/board/seeed/npi_imx6ull/npi_imx6ull.c b/board/seeed/npi_imx6ull/npi_imx6ull.c
index eb9ee55..c610d2c 100644
--- a/board/seeed/npi_imx6ull/npi_imx6ull.c
+++ b/board/seeed/npi_imx6ull/npi_imx6ull.c
@@ -100,7 +100,7 @@
 	gd->bd->bi_boot_params = PHYS_SDRAM + 0x100;
 
 #ifdef CONFIG_FEC_MXC
-	setup_fec(CONFIG_FEC_ENET_DEV);
+	setup_fec(CFG_FEC_ENET_DEV);
 #endif
 
 	return 0;