acpi: Support generation of GPIO descriptor
Add a function to write a GPIO descriptor to the generated ACPI code. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NWolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: NBin Meng <bmeng.cn@gmail.com> [bmeng: Drop comment about the type always being ACPI_GPIO_TYPE_IO] Signed-off-by: NBin Meng <bmeng.cn@gmail.com>
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