For the DM case, use the proper parameter for the regmap_init_mem call
(which is the ofnode, not the udevice).
Signed-off-by: Mario Six <mario.six@gdsys.cc>
Make the gdsys_rxaui_ctrl polarity setting function return the old
state to comply with the API requirements.
Signed-off-by: Mario Six <mario.six@gdsys.cc>