Unified how pins are return in `free` calls

[korken89]

Hi,

I unified so pins are returned the same for all peripherals.

[korken89]

I wonder if it would be beneficial to add a free method that only returns the peripheral, for efficiency (the added volatile reads add to code size). Presumably users would almost always want the pins back though?

If there should be a free without the pins, to me it does not make sense to not get back all the hardware that was used. The efficiency loss here are 4 register reads worst case, so the overhead does not seem like an issue to me. Would you agree?

[korken89]

There, it should be ready for a re-review now @jonas-schievink

[jonas-schievink]

bors r+

[bors[bot]]

Build succeeded:

• ci