Pin control fixes for v4.12:

- Make a few Intel Chromebooks with Cherryview DMI firmware
  work smoothly.

- A fix for some bogus allocations in the generic group
  management code.

- Some GPIO descriptor lookup table stubs. Merged through
  the pin control tree for administrative reasons.

- Revert the "bi-directional" and "output-enable" generic
  properties: we need more discussions around this. It seems
  other SoCs are using input/output gate enablement and these
  terms are not correct.

- Fix mux and drive strength atomically in the MXS driver.

- Fix the SPDIF function on sunxi A83T.

- OF table terminators and other small fixes.
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