arm64: imx8mm: imx8mn: imx8mp: Drop FEC GPR[1] board workaround

The FEC interface mode is now configured in common board_interface_eth_init()
and called by FEC MAC driver when appropriate. Drop the board side duplicates
if the same functionality.

Signed-off-by: Marek Vasut <marex@denx.de>
4 files changed