pinctrl: geminilake: Provide Interrupt Status register offset

Since some of the GPIO controllers use different Interrupt Status offset,
it make sense to provide it explicitly in the driver.

Signed-off-by: Andy Shevchenko <[e-mail]>
Acked-by: Mika Westerberg <[e-mail]>

drivers/pinctrl/intel/pinctrl-geminilake.c

···
 #define GLK_PAD_OWN	0x020
 #define GLK_PADCFGLOCK	0x080
 #define GLK_HOSTSW_OWN	0x0b0
+#define GLK_GPI_IS	0x100
 #define GLK_GPI_IE	0x110
 
 #define GLK_COMMUNITY(s, e)				\
···
 		.padown_offset = GLK_PAD_OWN,		\
 		.padcfglock_offset = GLK_PADCFGLOCK,	\
 		.hostown_offset = GLK_HOSTSW_OWN,	\
+		.is_offset = GLK_GPI_IS,		\
 		.ie_offset = GLK_GPI_IE,		\
 		.gpp_size = 32,                         \
 		.pin_base = (s),			\