Set up Ethernet

[bjackson312006]

Description

Once Ethernet code has been successfully merged into Embedded-Base (update: it has been successfully merged into Embedded-Base), this repo can be set up with Ethernet stuff.

Proposed Solution

• Make sure Ethernet is configured correctly in CubeMX, and is consistent with the Altium schematic.
• ^^ Probably need to set up the PHY settings in CubeMX so it generates nx_stm32_phy_custom_driver.c
• Go into app_netxduo.c and use the Embedded-Base Ethernet API (in u_nx_ethernet.c) to initialize Ethernet. Since this repo will (probably?) be flashed to more than one board (since there's more than one MSB), this is probably a good place to create a system to distinguish different MSB boards from each other, probably using #ifdefs or something.
• Probably also add incoming/outgoing Ethernet queues, and incoming/outgoing Ethernet threads.