payload_generator: Fix distribution for LLVM roll am: 9dbc6607f9

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2087853

Change-Id: Ifd021a046b0fcd0348602ba0e675ad448a71272a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>