Treat all tags as unsigned when comparing them

All tags are presumed to be unsigned, but some of them have signed
representations that are negative.  This caused problems in
AuthorizationSet.Deduplicate, where TAG_APPLICATION_DATA (signed rep
of -1879047492) was being sorted before TAG_INVALID (0), which was
presumed to always be first in the list.

BUG: 30701680
Change-Id: I67047cee21fd7617248022a4674779fe80d5ddfd
1 file changed