kernel: add gpio-it87

Since commit 910df3f06c we have build in
on all X86/64 platforms the gpio-it87 driver.

Since this change I am getting the following error message on boot.
 > kern.err kernel: [    1.009416] gpio_it87: no device

I do not have this device on my system. To prevent the nonsensical
message and the loading of the module I have added this as a package, so
that it can be installed later or during image building.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>
Reviewed-by: Philip Prindeville <philipp@redfish-solutions.com>

package/kernel/linux/modules/other.mk

@@ -295,6 +295,24 @@ endef
 $(eval $(call KernelPackage,gpio-pcf857x))
 
 
+define KernelPackage/gpio-it87
+  SUBMENU:=$(OTHER_MENU)
+  DEPENDS:=@GPIO_SUPPORT @TARGET_x86
+  TITLE:=GPIO support for IT87xx Super I/O chips
+  KCONFIG:=CONFIG_GPIO_IT87
+  FILES:=$(LINUX_DIR)/drivers/gpio/gpio-it87.ko
+  AUTOLOAD:=$(call AutoLoad,25,gpio-it87,1)
+endef
+
+define KernelPackage/gpio-it87/description
+  This driver is tested with ITE IT8728 and IT8732 Super I/O chips, and
+  supports the IT8761E, IT8613, IT8620E, and IT8628E Super I/O chips as
+  well.
+endef
+
+$(eval $(call KernelPackage,gpio-it87))
+
+
 define KernelPackage/ppdev
   SUBMENU:=$(OTHER_MENU)
   TITLE:=Parallel port support

target/linux/x86/64/config-4.19

@@ -218,7 +218,7 @@ CONFIG_GPIOLIB=y
 CONFIG_GPIOLIB_IRQCHIP=y
 CONFIG_GPIO_ACPI=y
 CONFIG_GPIO_ICH=y
-CONFIG_GPIO_IT87=y
+# CONFIG_GPIO_IT87 is not set
 CONFIG_GPIO_LYNXPOINT=y
 CONFIG_GPIO_SCH=y
 CONFIG_GPIO_SYSFS=y

target/linux/x86/64/config-5.4

@@ -192,7 +192,7 @@ CONFIG_GPIOLIB=y
 CONFIG_GPIOLIB_IRQCHIP=y
 CONFIG_GPIO_ACPI=y
 CONFIG_GPIO_ICH=y
-CONFIG_GPIO_IT87=y
+# CONFIG_GPIO_IT87 is not set
 CONFIG_GPIO_LYNXPOINT=y
 CONFIG_GPIO_SCH=y
 CONFIG_GPIO_SYSFS=y