Merge "init: restore mounts under /sys after enter_namespace" into main am: f73a959785

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

Change-Id: I080643c924474a7edb8565a7c3e76eaa41ec395c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>