feat: Add variant NUCLEO-C071RB

[thernstig]

Fixes #2537

[thernstig]

@fpistm I have NO idea if this is correct. I could not find any guideline on how to do for Nucleos. I took a look at https://github.com/stm32duino/Arduino_Core_STM32/pull/1745/files when doign this.

It seems I should have done changes in the variant_NUCLEO_C071RB.cpp and variant_NUCLEO_C071RB.h files in some way, that I probably got wrong.

I am completely ok with you updating anything in this commit manually.

I have no idea how to test it.

[fpistm]

Hi @thernstig
Could you rebase this PR on the main.
It requires to get the generic to be able to build (ldscript.ld).

[thernstig]

@fpistm Rebase done.

Are any updates needed in the .cpp and .h file? I have no idea what is needed there.

[fpistm]

@thernstig
I will review this afternoon. I will made the change.

[fpistm]

@thernstig
I've updated your branch.

• fix astyle issue
• order the pins to match board pinout (mainly Arduino Uno connector) and set the analog pins order.
• Define the USER_BTN, LED,...
• Add the USB support since STM32C071xx support USB. (not tested, only build enable)

[fpistm]

LGTM

[thernstig]

@fpistm thank you! If you think this looks ok I am ok to merge as well 🙂

Are you intending to release 2.9.0 soon 😄

[fpistm]

Are you intending to release 2.9.0 soon

Yes, in the coming days, anyway think that I've not tested this PR as I do not have the board. Anyway, I'm confident that it should work. Only a doubt about USB as it is the first time deployed on STM32C0xx series.