Merge "init: restore mounts under /sys after enter_namespace" into main am:...

Merge "init: restore mounts under /sys after enter_namespace" into main am: f73a9597 am: 2e6da523

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3528451



Change-Id: I84ec991dd51495596c195881a1620eb9c06e1b92
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>