tests/acpi: mark addition of table DSDT.roothp for unit testing root pci hotplug

tests/acpi: mark addition of table DSDT.roothp for unit testing root pci hotplug

A new binary acpi table tests/data/acpi/pc/DSDT.roothp is added in order to
unit test the feature flag that can disable/enable root pci bus hotplug on
i440fx. This feature was added with the commit:
3d7e78aa7777f0 ("Introduce a new flag for i440fx to disable PCI hotplug on
the root bus")

This change documents the fact that this new file addition was made as a part
of the unit test change.

Signed-off-by: Ani Sinha <ani@anisinha.ca>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20200918084111.15339-2-ani@anisinha.ca>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>