Keeping the IRQ chip definition static shares it with multiple instances
of the GPIO chip in the system. This is bad and now we get this warning
from GPIO library:

"detected irqchip that is shared with multiple gpiochips: please fix the driver."

Hence, move the IRQ chip definition from being driver static into the struct
intel_pinctrl. So a unique IRQ chip is used for each GPIO chip instance.

This patch is heavily based on the attachment to the bug by Christoph Marz.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=202543
Fixes: 6e08d6bb ("pinctrl: Add Intel Cherryview/Braswell pin controller support")
Depends-on: 83b9dc11 ("pinctrl: cherryview: Associate IRQ descriptors to irqdomain")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>