AM437x EPOS evm use external clock for RMII interface.
Enable the same in DT.
Signed-off-by: George Cherian <george.cherian@ti.com>
Reported-by: Nishanth Menon <nm@ti.com>
Tested-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>