duplicate FVName GUIDs

[orangecms]

Check if it's a bug in utk or in the vendor firmware - neither is desirable, but our side is fixable.

See fiedka/fiedka#12 where the issue was spotted.

Addendum: UEFITool also lists those duplicates. The question is whether utk should ever handle/support such scenarios: The image file stems from an upgrade, so it could be that it is actually not meant to be a complete nor single image. Cumulative updates, two images in one file for different board variants etc may be the case here.

[NikolajSchlej]

Because FVName GUID is optional, and there are no requirements on the container that has volumes for those GUIDs to be unique (there are almost no requirements on that container at all, but very obvious ones like "volumes should not overlap", that's why I'm calling it "raw area" in UEFITool), it's not an issue that those GUIDs are duplicated, at least from parser/editor tool standpoint. Can make a warning about it, but it doesn't break the spec (at least in the "word, not spirit" sense).