- document that the QN9080DK has an alternative firmware for the
debugger/programmer that supports J-Link
- allow selecting the debugger firmware via parameter / environment
variable
- add `JLINK_DEVICE` parameter to allow flashing via J-Link
With `MOST_RECENT_PORT=1` the TTY interface of the most recently
connected board with an embedded NXP debugger is selected. If only
a single board with an embedded NXP debugger is selected, this will
automatically connect to the correct board using:
```
make term MOST_RECENT_PORT=1
```
The QN9080DK is the developer board reference from NXP for the QN908x
CPUs. The developer kit comes with two boards: a larger PCB with many
peripherals and a much smaller "USB dongle". This board adds initial
support for the larger "DK board". At the moment, with the minimal CPU
support this board only configures the GPIOs available in the board,
namely the RGB LED and the two user buttons.
