acpi/acpigen: add acpigen_resource_io to generate I/O resource

Add the acpigen_resource_io helper function to generate an I/O range
resource.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Change-Id: I177f59b52d4dbbff0a3ceeef5fc8c7455cef9ff8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75044
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <inforichland@gmail.com>

src/include/acpi/acpigen.h

@@ -694,6 +694,7 @@ void acpigen_resource_qword(u16 res_type, u16 gen_flags, u16 type_flags,
 	u64 gran, u64 range_min, u64 range_max, u64 translation, u64 length);
 
 void acpigen_resource_bus_number(u16 bus_base, u16 bus_limit);
+void acpigen_resource_io(u16 io_base, u16 io_limit);
 
 /* Emits Notify(namestr, value) */
 void acpigen_notify(const char *namestr, int value);