Fix lunch choices for git_main am: f544c411ce

Original change: https://android-review.googlesource.com/c/device/linaro/poplar/+/2811393

Change-Id: Iec00b8edf7472186db4a7072135730147444f1a9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>