[PATCH] i2c: allow building emev2 without slave mode again

[Wolfram Sang]

> > My conclusion for now is:
> > 
> > There needs something to be done surely, but currently I don't have the
> > bandwidth to do it or even play around with it. I am not fully happy
> > with your patches as well because __maybe_unused has some kind of "last
> > resort" feeling to me.
> 
> I generally like __maybe_unused, but it's a matter of personal preference.
> We could avoid the __maybe_unused if the reg_slave/unreg_slave callback
> pointers are always available in struct i2c_algorithm.

Yes, I was thinking in this direction, looking at how PM does it. Needs
some playing around, though.

> Just for reference, see below for my combined patch, in case you decide
> to use that at a later point.

Thanks a lot!

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