Merge "Move CheckAtMostOneLatest and CheckUniqueLoopDm to be private methods" am: 088ee40d86

Original change: https://android-review.googlesource.com/c/platform/system/apex/+/1537581

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I618b8c6784a7b150cb06a5b096fe3b9b268a1d7a