boards/nucleo-wl55jc: add new board

[mlyszczek]

This patch includes bare minimum support for nucleo-wl55jc board.
It compiles and nsh shell is working properly on virtual com port
over USB. 3 onboard leds with userled driver are working.

Signed-off-by: Michał Łyszczek michal.lyszczek@bofc.pl

Summary

Impact

None - new board

Testing

Compiles and nsh works

[acassis]

@mlyszczek maybe you could consider moving the README.txt to become a board documentation: https://nuttx.apache.org/docs/latest/platforms/index.html but to be honest I have mixed feelings about it. I think it is nice to have boards documentation in our web site, but sometimes it is a pain in the ass to search for it when you are testing a new board. I think the best alternative should be generating the board documentation automatically from these README.txt

[mlyszczek]

Yeah, I don't see a problem. I'm thinking about doing it in another PR maybe? Because I see I will have to also add documentation for stm32wl5 chip family as well. So I could add both of them in documentation PR. How does that sound?

[acassis]

Yeah, I don't see a problem. I'm thinking about doing it in another PR maybe? Because I see I will have to also add documentation for stm32wl5 chip family as well. So I could add both of them in documentation PR. How does that sound?

That would be perfect! Thank you very much!