Eth updates.
Eth updates.

* Fix link_status()
* Update low-power mode.

kwagyeman/openmv,openmv/openmv,kwagyeman/openmv,openmv/openmv,iabdalkader/openmv,kwagyeman/openmv,iabdalkader/openmv,kwagyeman/openmv,openmv/openmv,iabdalkader/openmv,iabdalkader/openmv,openmv/openmv