This is the first batch of MFD fixes for 3.10.

It's bigger than I would like, most of it is due to the big ab/db8500 merge
that went through during the 3.10 merge window.

So we have:

- Some build fixes for the tps65912 and ab8500 drivers.
- A couple of build fixes for the the si476x driver with pre 4.3 gcc
  compilers.
- A few runtime breakage fixes (probe failures or oopses) for the ab8500
  and db8500 drivers.
- Some sparse or regular gcc warning fixes for the si476x, ab8500 and
  cros_ec drivers.
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