Extend lan966x with RGMII support. The MAC supports all RGMII_* modes.
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Link: https://lore.kernel.org/r/20220902111548.614525-1-horatiu.vultur@microchip.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>