NNAPI SL Benchmark - Add option to specify vendor [2/n]. am: 0d7c9e2853 am: c77a35d9dc

Original change: https://android-review.googlesource.com/c/platform/test/mlts/benchmark/+/2096395

Change-Id: Icb451c2dc172a8ca5a840abc144f59d79afcaa9c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>