Required for PackageManagerService to perform restorecon recursively on a
staging dir.

Addresses the following denial:
avc: denied { open } for name="oat" dev="mmcblk0p28" ino=163027 scontext=u:r:system_server:s0 tcontext=u:object_r:dalvikcache_data_file:s0 tclass=dir

Bug: 19550105
Bug: 20087446
Change-Id: I0f6ebb79745091ecb4d6d3dbe92f65606b7469da