MFD Fixes for 3.5

- 3 Palmas fixes, 1 of them being a build error fix.
- 2 mc13xx fixes. 1 for fixing an SPI regmap configuration and another one for
  working around an i.Mx hardware bug.
- 1 omap-usb regression fix.
- 1 twl6040 build breakage fix.
- 1 file deletion (ab5500-core.h) that was overlooked during the last merge
  window.
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