hw/i386/acpi: Remove PCMachineClass::legacy_acpi_table_size

PCMachineClass::legacy_acpi_table_size was only used by the
pc-i440fx-2.0 machine, which got removed. Remove it and simplify
acpi_build().

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20240617071118.60464-6-philmd@linaro.org>
2 files changed