imx6: isiotmx6ul: Add FEC support

Add FEC support for Engicam Is.IoT MX6UL module.

Cc: Stefano Babic <sbabic@denx.de>
Cc: Matteo Lisi <matteo.lisi@engicam.com>
Cc: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/arch/arm/cpu/armv7/mx6/Kconfig b/arch/arm/cpu/armv7/mx6/Kconfig
index 3de1be5..0bceaac 100644
--- a/arch/arm/cpu/armv7/mx6/Kconfig
+++ b/arch/arm/cpu/armv7/mx6/Kconfig
@@ -246,6 +246,7 @@
 	select MX6UL
 	select OF_CONTROL
 	select DM
+	select DM_ETH
 	select DM_GPIO
 	select DM_I2C
 	select DM_MMC