rocker: fix speed type in rocker_cmd_get_port_settings_ethtool_process()

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
rocker: use DUPLEX_* defines for duplex values

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
rocker: add autonegotiation ethtool get support

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
rocker: implement ethtool set settings

Signed-off-by: Jiri Pirko <jiri@resnulli.us>