libnds - Improve cardReset for DSi

[Lorenzooone]

Making the issue here, since libnds has issues blocked.
Hope it's fine!

On DSi, one can reset the cartridge by simply turning off and then on slot 1.
This could be used to improve cardReset, so it works properly on DSi as well.
0x04004012 and 0x04004014 are the registers handling the timeout of these operations, and they can be changed to make the operation faster.
http://problemkaputt.de/gbatek-dsi-control-registers-scfg.htm

[AntonioND]

I assume you have some code in your project that fixes this, what did you do in the end to get it to work? You could also send a PR and we discuss the changes there.

[Lorenzooone]

Oh no, I simply restored the old one while testing stuff... So not really...

[asiekierka]

cardReset() in libnds doesn't really "reset" the cartridge, as that cannot be done on NDS without ejection/reinsertion, while on DSi this requires controlling power to the slot.

See https://github.com/NovaSquirrel/WildStorage/blob/main/source/main.c#L254-L285 for an example of a card initialization procedure I wrote in the past. In general, I think a good chunk of card.h needs to be thrown out and reconsidered, with functions that match an user's typical workflow more.