Merge "Check slot in reboot function" am: 70127316bf am: 4635bad13b am: 3720d381a9

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1504110

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I9f3568bf1c225ed9b9e498c0ea792804d8623f56