Revert "sprout: disable selinux for now"

This reverts commit 3df68ae670c9102e218a9454ad03f3c6c7678120.
sprout: disable selinux correctly

Change-Id: I6eee345e2ebcb774d7f090f6631bbfa81a877c02
Signed-off-by: rebelos <ks50497@gmail.com>