Merge "Implement Safemode alarm in VcnGatewayConnection." am: 30d9bfa03b am: 875a7d0764 am: 8c576fb131

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1577286

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I1784c40cfd58b241fb7f7b27ec569f74fe14c293