gpio-v3.12-1

This is the bulk of GPIO changes for the v3.12 series:

- A new driver for the TZ1090 PDC which is used on the metag
  architecture.

- A new driver for the Kontron ETX or COMexpress GPIO block.
  This is found on some ETX x86 devices.

- A new driver for the Fintek Super-I/O chips, used on
  some x86 boards.

- Added device tree probing on a few select GPIO blocks.

- Drop the Exynos support from the Samsung GPIO driver.
  The Samsung maintainers have moved over to use the
  modernized pin control driver to provide GPIO for the
  modern platforms instead.

- The usual bunch of non-critical fixes and cleanups.
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