colibri-imx6ull: migrate fec to using driver model

Migrate Ethernet FEC to using driver model.
Drop PHY_MICREL_KSZ90X1 which slipped in from Apalis iMX6.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Igor Opaniuk <igor.opaniuk@toradex.com>
3 files changed