pinctrl: icelake: Add Ice Lake-N PCH pin controller support

This adds pinctrl/GPIO support for Intel Ice Lake-N PCH. The Ice Lake-N
PCH GPIO is based on the same version of the Intel GPIO hardware than
Intel Cannon Lake with different set of pins and ACPI ID.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>