pinctrl: intel: Add Intel Gemini Lake pin controller support

pinctrl: intel: Add Intel Gemini Lake pin controller support

BugLink: http://bugs.launchpad.net/bugs/1645951
This driver adds pinctrl/GPIO support for Intel Gemini Lake SoC. The
GPIO controller is based on the next generation GPIO hardware but still
compatible with the one supported by the Intel core pinctrl/GPIO driver.

This commit includes material from David E. Box.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
(cherry picked from commit 6693f9f96a0936488dd7876b8079933786e27b1b)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>