pinctrl: intel: Share struct intel_pinctrl for wider use

There are few drivers for Intel SoC GPIO which may utilize
the same data structure to describe this IP.

Share struct intel_pinctrl for wider user.

Acked-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>