installd restorecon now requires getattr.

avc: denied { getattr } for path="/mnt/expand" dev="tmpfs" ino=3146 scontext=u:r:installd:s0 tcontext=u:object_r:mnt_expand_file:s0 tclass=dir permissive=0

Bug: 21856349
Change-Id: Ib9984182a71408d5cb803d453f148856b68569e3