LUCI: Add 'product' property for qemu builds am: 948a48aa04

Original change: https://android-review.googlesource.com/c/platform/art/+/2982192

Change-Id: I9c827242e289546188d3c28441c2f3f6efcf17d6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>