Add: "USB Micro AB" to serial port choices, currently not available

### NetBox version

v3.0.6

### Python version

3.9

### Steps to Reproduce

Our server has a serial port type "USB Micro AB", it is definied in the USB standard, it is not available as choice in the dropdown for serial USBs.

### Expected Behavior

Make "USB Micro AB" available to choices list

### Observed Behavior

Not available