android: Allow running some singletons in parallel. am: e59c0db5 am:...

android: Allow running some singletons in parallel. am: e59c0db5 am: bef24e82 am: f47cd87d am: 40c861b7

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2593066



Change-Id: I60f4df2ee06fbe5996c183b483c419fe3cc9f36a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>