selinux: New rw privileges for themes

- New theme_data_file context for files under /data/system/theme
- Permit systemserver to create files/dirs under /data/resource-cache
- Permit systemserver to create files/dirs under /data/system/theme

Change-Id: Id597fc20b477ea395a8631623f26a7edde280799
sepolicy: remove stray + in type statement

Change-Id: Ic34c9ae32658541064a63153612145c6fd3d55b3
bump

Change-Id: Ic22a9d7d2217d33b6cf40177b3f070f7d740ae4a