Merge changes from topic "nnapi-aosp-sync"

* changes:
  NNAPI: Add execution preference to prepareModel (runtime)
  Upgrade NeuralNetworks v1.0 to v1.1 followup CL
  Use stubs libs for android.test.base/runner/mock
  Add NeuralNetworksApiBenchmark to apct suite metric
  Finalize STRIDED_SLICE
  Add validation tests for remaining operations
  Fix the spec for TENSOR_QUANT8_ASYMM to match our validation.
  Use abort() instead of exit(1) for bad activation functions
  Remove unused / unimplemented parameter "crops" for BATCH_TO_SPACE
  Make NNAPI support BroadcastSub and BroadcastDiv.