Add negative tests to the Neuralnetworks HAL

This CL adds negative tests to:
* IDevice::getSupportedOperations
* IDevice::prepareModel
* IPreparedModel::execute

It does not make sense to have negative tests for the remaining HAL
entries:
* IDevice::getStatus (all returned values are valid)
* IDevice::getCapabilities (no input or state)
* IEvent::notify (synchronization callback primitive)

Bug: 63905942
Test: mm, running on sample driver has expected output
Change-Id: Ia3cf5ce05dd07ff3f688395b8d0e581851909028