hw/arm/virt: Remove VirtMachineClass::no_its field

The VirtMachineClass::no_its field was only used by
virt-2.7 machine, which got removed. Remove it and
simplify virt_instance_init() and virt_acpi_build().

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
3 files changed