Only verify output of models a vendor nn service fully supports

Some service drivers won't be able to support all operations. In those
cases, run the test as far as it can go, but ignore the output data.

For example, the hvx nn service does not support svdf, so it should
attempt to prepare and execute the model, but the test should not fail
if the hvx driver reports an error. However, hvx indicates it is able to
run MAX_POOL_2D, so the test should fail if that output is incorrect.

Bug: 63905942
Test: mm
Test: run vts binary on hvx service
Change-Id: I3ebc05836c8e070b66daa2e38b107f96637ca812