Superuser: PT-rPT translations

Change-Id: Ic3862ca92aa18ff837ca2a28b8a487c0fb725fc4
Make emulated storage available via su.

Apps (e.g. file managers) expect that they get the same view of files in
su and non-su mode.

Change-Id: I613d021dddb7b90c34bd6d7cf6d2234448404731