Support don't care outputs in VTS tests

- Updated test generator to generate helper functions
- Re-generated VTS tests

Actual uses of the infrastructure (IgnoredOutput) come with the test
specs of LSTM.

Bug: 63905942
Test: test.py on host
Test: NeuralNetworksTest on Angler
Test: VtsHalNeuralnetworksV1_0TargetTest on Angler
Change-Id: I464aa1cd77fd2d2fecab5d01dd223346fce04f7b
36 files changed
tree: 284d3f2137285bb5f4a29fc826e9d0e906b1dff4
  1. nn/
  2. Android.bp