Address the following denial:
type=1400 audit(1453854842.899:7): avc: denied { search } for pid=1512 comm="sdcard" name="/" dev="tmpfs" ino=7547 scontext=u:r:sdcardd:s0 tcontext=u:object_r:tmpfs:s0 tclass=dir permissive=0

vold: EmulatedVolume calls sdcard to mount on /storage/emulated.

Bug: 26807309
Change-Id: Ifdd7c356589f95165bba489dd06282a4087e9aee