tests/acpi: i386: allow FACP acpi table changes

tests/acpi: i386: allow FACP acpi table changes

The FACP table is going to be changed for x86/q35 machines. To be sure
the following changes are not breaking any QEMU test this change follows
step 2 from the bios-tables-test.c guide on changes that affect ACPI
tables.

Signed-off-by: Liav Albani <liavalb@gmail.com>
Acked-by: Ani Sinha <ani@anisinha.ca>
Message-Id: <20220304154032.2071585-2-ani@anisinha.ca>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>