GPIO fixes for the v3.13 series:

- Fix compile warnings.

- Fix overly talkative diagnostic messages from usual use
  cases wrt GPIO descriptors.

- Add a documentation 00-INDEX

- Use platform GPIOs as fallback when ACPI or device tree is
  used as the primary means to get GPIO lines.

- A bug fix for the MPC8572/MPC8536 fixing erroneous input data.
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