imx6: add support for the intel gbit driver on GW5520
The Gateworks GW5520 board uses 2x intel gigabit mac's, instead of the
internal i.MX6 FEC.
Add support for these.
Signed-off-by: Scott V. Kamp <[email protected]>
Signed-off-by: Koen Vandeputte <[email protected]>