cleanups - remove non-used pca8574 and oraled drivers

[BazookaJoe1900]

Describe problem solved by the proposed pull request
Both led drivers (pca8574 and oraled) are not used, but keep being compiled on many boards.
there is no pca8574 and oraled start on any rcS.
removed as discussed on #12832

Test data / coverage
none done by me....

[dagar]

Can you delete the actual driver code?

[BazookaJoe1900]

@dagar @LorenzMeier. I can delete it completely, but are you 100% sure that nobody uses it?
users might use it with non-upstream code, or call it by rc.extra, or call by runtime....

[dagar]

Yes for the same reasons mentioned in #12832.
If there's value in keeping any of these things we can resurrect them with some minimal real testing, but based on the state of this code I don't see any real users. Keeping anything in tree without compiling is even worse.

[BazookaJoe1900]

Yes for the same reasons mentioned in #12832.
If there's value in keeping any of these things we can resurrect them with some minimal real testing, but based on the state of this code I don't see any real users. Keeping anything in tree without compiling is even worse.

Done

[BazookaJoe1900]

refs to #12409