This is the first batch of MFD fixes for 3.9.

With this one we have:

- An ab8500 build failure fix.
- An ab8500 device tree parsing fix.
- A fix for twl4030_madc remove routine to work properly (when built-in).
- A fix for properly registering palmas interrupt handler.
- A fix for omap-usb init routine to actually write into the hostconfig
  register.
- A couple of warning fixes for ab8500-gpadc and tps65912.
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