[automerger skipped] Add PACK operation to NNAPI feature level 6. am: 0cedad6979 -s ours

am skip reason: Merged-In Ic15d047b70c62437b4f0db6f2ca10127591ae07c with SHA-1 79d63db0c8 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/16230739

Change-Id: I786f07808791e39cca6b0819510b3e47ea8e7f61