hw/arm/Kconfig: select ARM_GICV5 for ARM_VIRT board

When building the Arm "virt" board, pull in the GICv5. We haven't added support for creating or wiring up the GICv5 in that board yet, but adding it to the Kconfig early means that the GICv5 code will be compiled and so we can have more confidence that the individual commits building it up are correct (or at least compile). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-id: 20260327111700.795099-5-peter.maydell@linaro.org