edify: bring back SetPermissionsRecursive

* we still need this, even with block-based OTAs.

This partially reverts commit f388104e

includes the following commit:

commit d810b09316cb1abc55b9d44ac008a4245ba642fe
Author: LuK1337 <priv.luk@gmail.com>
Date:   Fri Sep 1 00:12:29 2017 +0200

    edify: Don't append capabilities if path starts with /tmp

    * tmpfs does not support xattrs.

    Change-Id: I90ce6455e3da91d3018f2f2a427e398281e654ab

Change-Id: I4943e2e89ee5c810a63746c570dc5e31e95b8c53