Remove #testNNAPI.* tests from TFLiteTest

Renamved NNTest to BenchmarkTestBase, moved it's testNNAPI*
method to new NNTest derived from BenchmarkTestBase. This
way TFLiteTest class doest duplicate these tests.

Test: Run NNtest/TFLiteTest tests
Bug: 115720411
Change-Id: I0c8f9ee60d50d5650bb32350f7bf7bba3a1658f7
Merged-In: I0c8f9ee60d50d5650bb32350f7bf7bba3a1658f7
(cherry picked from commit 8ba696106d9052912b3069e8a67d8500532f363f)
3 files changed