Add tests for javax.xml.validation APIs

Bug: 119393918
Bug: 181671215
Test: atest CtsLibcoreTestCases:libcore.javax.xml.validation
Change-Id: Ie7a5c3eeed5c1ac5cefa0c4718507fbfcf09cf1a
(cherry picked from commit d892d0933c00151266f459dc731b4c176cb41f59)
Merged-In: Ie7a5c3eeed5c1ac5cefa0c4718507fbfcf09cf1a
3 files changed