gpio_acpi: Turn this into a child device of gpio_intel.

* This makes gpio_intel much more independent from gpio_acpi.

* Less adjustments needed in gpio drivers for using gpio_acpi.

* Some slight c

gpio_acpi: Turn this into a child device of gpio_intel.

* This makes gpio_intel much more independent from gpio_acpi.

* Less adjustments needed in gpio drivers for using gpio_acpi.

* Some slight cleanup, and refactoring turning device_t args to
struct gpio_acpi_softc * args.

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gpio_intel: Support integrated GPIO controllers of the Cherry Trail SoC.

* The gpio_acpi module takes care of probing and setting up the ACPI
GPIO-signaled events and the ACPI address space handle

gpio_intel: Support integrated GPIO controllers of the Cherry Trail SoC.

* The gpio_acpi module takes care of probing and setting up the ACPI
GPIO-signaled events and the ACPI address space handler, utilizing the
gpio interface provided by gpio_intel for the actual GPIO accesses.

* So far gpio_intel can only be used for the ACPI-5.0 GPIO features.

* This makes ACPI gpio events (which replace GPE interrupts on many
current x86 SoC devices) work, and provides a handler for the
GeneralPurposeIo Opregions of each GPIO controller.

* With this the HP x2 210 detachable correctly recognizes unplugging
of the power supply, and opening/closing of the lid.

* Further work is still needed to refactor gpio_intel to make adding
support for other SoC/CPU versions easier.

* The gpio_if.m interface is still a prototype that only provides a
minimum of functionality that is needed to get gpio_acpi working.

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