[FEATURE] RPi 4B Ethernet networking

### Is your feature request related to a problem? Please describe.

There is currently no Ethernet networking support for the RPi 4B.

### Describe the solution you'd like

I would like Ethernet networking support to be implemented for the Pi 4B so that users can use all of the NuttX networking stack on this device.

### Describe alternatives you've considered

_No response_

### Verification

- [x] I have verified before submitting the report.