tests: acpi: tolerate "virt/SSDT.memhp" mismatch temporarily

Tolerate "virt/SSDT.memhp" mismatch temporarily to let
"check-qtest-aarch64" pass until we refresh the AML after
advancing the edk2 submodule to tag edk2-stable202008.

Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugs.launchpad.net/qemu/+bug/1852196
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Acked-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200908072939.30178-5-lersek@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>

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

@@ -1 +1,2 @@
 /* List of comma-separated changed AML files to ignore */
+"tests/data/acpi/virt/SSDT.memhp",