Merge "inner_build: add --multitree-build to soong invocations" am: e0d05833b9 am: 4914d5f716 am: c88d7a6339 am: 034ae4c3dd am: 164b7ccb60

Original change: https://android-review.googlesource.com/c/platform/build/orchestrator/+/2488756

Change-Id: Ie8797b1f9a654d10dc83e82eabf1da7606d77d31
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>