Remove extra tests from NNAPI VTS validation tests

Do not run validation on "inputs_as_internal" and
"all_tensors_as_inputs" variants.

Bug: 138149072
Bug: 149840439
Test: mma
Test: VtsHalNeuralnetworksV1_*TargetTest
Change-Id: I0699ed6703e48b6c4bc0e7a392b79c12770f04c9