pinctrl: intel: Make offset to interrupt status register configurable

Some GPIO blocks have the interrupt status (GPI_IS) offset different
than it normally is, so make it configurable. If no offset is specified
we use the default.

While there remove two unused constants from the core driver.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/intel/pinctrl-intel.h

@@ -73,6 +73,8 @@ struct intel_padgroup {
  * @hostown_offset: Register offset of HOSTSW_OWN from @regs. If %0 then it
  *                  is assumed that the host owns the pin (rather than
  *                  ACPI).
+ * @is_offset: Register offset of GPI_IS from @regs. If %0 then uses the
+ *             default (%0x100).
  * @ie_offset: Register offset of GPI_IE from @regs.
  * @pin_base: Starting pin of pins in this community
  * @gpp_size: Maximum number of pads in each group, such as PADCFGLOCK,
@@ -98,6 +100,7 @@ struct intel_community {
 	unsigned padown_offset;
 	unsigned padcfglock_offset;
 	unsigned hostown_offset;
+	unsigned is_offset;
 	unsigned ie_offset;
 	unsigned pin_base;
 	unsigned gpp_size;