Restrict default system_server profile usage to U+ am: b70a91739d am: fbd8284d9e

Original change: https://android-review.googlesource.com/c/platform/art/+/2369875

Change-Id: I011f3ee79bb3051c96a2176012d081f6b678ce0e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>