NNAPI SL Benchmark - Add option to specify vendor [5/n].

Test: test/mlts/benchmark$ ./build_and_run_benchmark.sh -x -s -m mobilenet_v1_1.0_224_quant* -n arm

Change-Id: Ic3edac70506be42b4d6d2278377c0ff49ef72a8a
2 files changed