tests/acpi: Allow update of DSDT.cxl

The _STA value returned currently indicates the ACPI0017 device
is not enabled.  Whilst this isn't a real device, setting _STA
like this may prevent an OS from enumerating it correctly and
hence from parsing the CEDT table.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20240126120132.24248-11-Jonathan.Cameron@huawei.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 +1,2 @@
 /* List of comma-separated changed AML files to ignore */
+"tests/data/acpi/q35/DSDT.cxl",