Pin control fixes for the v3.19 series:

- Fix two deadlocks around the pin control mutexes,
  a long-standing issue that manifest itself in
  plug/unplug of pin controllers. (Tagged for stable.)

- Handle an error path with zero functions in the
  Qualcomm pin controller.

- Drop a bogus second GPIO chip added in the Lantiq
  driver.

- Fix sudden IRQ loss on Rockchip pin controllers.

- Register the GIT tree in MAINTAINERS.
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