tests/acpi: Add void tables for Q35/TPM-TIS bios-tables-test

Add placeholders for TPM and DSDT reference tables for
Q35 TPM-TIS tests and ignore them for the time being.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>

Message-Id: <20200609125409.24179-3-eric.auger@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

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

@@ -1 +1,3 @@
 /* List of comma-separated changed AML files to ignore */
+"tests/data/acpi/q35/DSDT.tis",
+"tests/data/acpi/q35/TPM2.tis",