Merge "snapuserd: Split Tempdevice into a separate file." into main am:...

Merge "snapuserd: Split Tempdevice into a separate file." into main am: 1d8e349c am: 76f3af72 am: d7dc8d64

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2640541



Change-Id: I262f14e2976c8f9d71412315dbd20f296965cad1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>