Reland "Revert "rootdir / sdcard : Stop creating /data/media/obb.""

This reverts commit 997a2d93.

Reason for revert: This revert is needed, just also need some selinux rules for changes to the script that runs if this folder is present.

Bug: 136199978
Change-Id: Ie0544954965e3c90abc2f833c41949976c3bea65
(cherry picked from commit 35708b9d)