Revise tests so weights and biases are no longer inputs

This CL turn them into constant operands set at model building time.
Also fixed problems in the test generator on handling FP literals in
model paramters.

Original tests are renamed with _weights_as_inputs suffix.

Bug: 67015862
Bug: 63905942
Test: NeuralNetworksTests on Angler
Change-Id: Ic59c78e7e6fcb143fb05a0360baa281b7528050c
40 files changed
tree: 479d7c0c0069ce9902b85b17aa96196e3b52b502
  1. common/
  2. driver/
  3. runtime/
  4. tools/
  5. Android.bp
  6. README.txt