Create world readable, system writeable /data/resource-cache.

/data/resource-cache is used to store idmap files.

Change-Id: I9b1dbc8d607333b71c05f55a4a402ae92193c36c

rootdir/init.rc

@@ -166,6 +166,11 @@ on post-fs
     chown system system /data/dalvik-cache
     chmod 0771 /data/dalvik-cache
 
+    # create resource-cache and double-check the perms
+    mkdir /data/resource-cache 0771 system system
+    chown system system /data/resource-cache
+    chmod 0771 /data/resource-cache
+
     # create the lost+found directories, so as to enforce our permissions
     mkdir /data/lost+found 0770
     mkdir /cache/lost+found 0770