restorecon /property_contexts

/property_contexts exists before selinux policies are loaded, so we must
restorecon before other processes can access it

Bug: 21852512
Change-Id: Ie983caac635eb928ab19eea996a5625f3673de39
diff --git a/init/init.cpp b/init/init.cpp
index 86aed9a..958db36 100644
--- a/init/init.cpp
+++ b/init/init.cpp
@@ -602,6 +602,7 @@
     restorecon("/dev");
     restorecon("/dev/socket");
     restorecon("/dev/__properties__");
+    restorecon("/property_contexts");
     restorecon_recursive("/sys");
 
     epoll_fd = epoll_create1(EPOLL_CLOEXEC);