tests/qtest/bios-tables-test: Prepare for changes in the DSDT table

tests/qtest/bios-tables-test: Prepare for changes in the DSDT table

This commit adds DSDT blobs to the whilelist in the prospect to
allow changes in the GPEX _OSC method.

Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Acked-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20250714080639.2525563-5-eric.auger@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>