sepolicy: adding vendor_ prefix changes for pub/priv dirs.

to avoid naming colision with system types we are adding vendor_ prefix for all vendor defined types.

Change-Id: I1396f2c6d9576af3c3755096bb1e69d254b6db4e
diff --git a/legacy/vendor/common/system_server.te b/legacy/vendor/common/system_server.te
index b1ddddc..3bcd946 100644
--- a/legacy/vendor/common/system_server.te
+++ b/legacy/vendor/common/system_server.te
@@ -130,7 +130,7 @@
 allow system_server sysfs_graphics:file rw_file_perms;
 
 # timerslack_ns
-allow system_server { location_app system_app } :file write;
+allow system_server { vendor_location_app system_app } :file write;
 
 #OpenGLES version
 get_prop(system_server, vendor_opengles_prop)