Storage; Fix apps2sd for noemulated secondary storage

A recent commit:

  commit 9d0514d8
  Author: Thomas Wendt <thoemy@gmx.net>
  Date:   Wed Jan 14 16:18:19 2015 +0100

    Storage: Fix moving apps to external storag

changed the supported case from secondary storage that was marked
as noemulated to external storage that was noemulated.

Both are valid use-cases for apps2sd.

This commit restores the secondary storage logic removed in
the previous commit and allows either configuration to work
for apps2sd.

Change-Id: I069571dfe10c6e8e2247b26f3de0d185ba10d5a2