Mark some test cases as being valid RDFa 1.1 Lite.

I'm using the HTML output from the test suite as HTML+RDFa document-conformance test cases for the W3C validator, and since the validator supports both RDFa 1.1 (full) and RDFa 1.1 Lite, it's useful for me to be able to identify which test cases conform to Lite. I can imagine it might be useful to other people for other purposes as well.