Fix lunch choices for git_main am: acfa31a673 am: 086c083ddd

Original change: https://android-review.googlesource.com/c/device/google/bramble/+/2809727

Change-Id: If1f1a7df5f697097dab6099cfa0318a05570ac20
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>