Fix missing domain transition for snapuserd in recovery.

System files in recovery are labelled as rootfs, so we need an explicit
transition to snapuserd. Without this, factory data resets will fail
with a VABC OTA pending, with the following denial:

        avc:  denied  { entrypoint } for  pid=522 comm="init" path="/system/bin/snapuserd"
                dev="rootfs" ino=1491 scontext=u:r:snapuserd:s0 tcontext=u:object_r:rootfs:s0
                tclass=file permissive=0

Bug: 179336104
Test: factory data reset with VABC OTA pending
Change-Id: Ia839d84a48f2ac8ccb37d6ae3b1f8a8f7e619931
1 file changed