DO NOT MERGE frameworks-test: adding missing @SmallTest

This activates all frameworks-test tests in runs of the continuous
platform tests.

Test: $ runtest frameworks-net passes (expect Tether
Bug: 32561414

(cherry picked from commit fa8a6f62)

Change-Id: I84f9aecfbf9ebe07c6fcfec26acb2c2cfaae2d60