gpio: of: Break out OF-only code

The core gpiolib should not contain any OF/device tree-only
code. Try to break out the main part of it and push it down
into the optional gpiolib-of.c part of the library.

Create a local gpiolib-of.h header and move stuff around a
bit to get a clean cut.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20190717071001.3858-1-linus.walleij@linaro.org

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