tests: acpi: update path in rebuild-expected-aml

tests: acpi: update path in rebuild-expected-aml

Since commit 1e8a1fae7464("test: Move qtests to a separate
directory") qtests are now placed in a separate folder and
this breaks the script used to rebuild the expected ACPI
tables for bios-tables-test. Update the script with correct
path.

Fixes: 1e8a1fae7464("test: Move qtests to a separate directory")
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20200114165138.15716-1-shameerali.kolothum.thodi@huawei.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>