In AM335x GP EVM, Atheros 8031 phy is used, enable the driver as
AM335x SoC RGMII delay mode has to be enabled in phy as mentioned
in the silicon errata Advisory 1.0.10
Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com> Acked-by: Joe Hershberger <joe.hershberger@ni.com>