In ACPI resource descriptors, alternatives are marked with
StartDependent tags. Only the last set is terminated with EndDependent.
Therefore, since we only return the first alternative list for now,
ignore the first StartDependent tag and terminate enumeration at the second.
In the future we will need to build the full set of alternative lists here,
which will also make the unit test succeed fully.
This should fix random resource conflicts and make COM ports usable.
