Also mount /sys/fs/selinux am: 9971bae91d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/23710044

Change-Id: I013021ffb7e906d3e63181280614366da9db880c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>