acpi: Allow pxb DSDT acpi table changes

Signed-off-by: Jiahui Cen <cenjiahui@huawei.com>
Signed-off-by: Xingang Wang <wangxingang5@huawei.com>
Message-Id: <1612490205-48788-2-git-send-email-wangxingang5@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>

tests/qtest/bios-tables-test-allowed-diff.h

 /* List of comma-separated changed AML files to ignore */
+"tests/data/acpi/virt/DSDT.pxb",