Revert "Revert "SELinux policy changes for re-execing init.""

This reverts commit c450759e8e67caa7a77ca078b1478b018a9b848b.

There was nothing wrong with this change originally --- the companion
change in init was broken.

Bug: http://b/19702273
Change-Id: I9d806f6ac251734a61aa90c0741bec7118ea0387
diff --git a/file_contexts b/file_contexts
index e36a6c3..0fc096d 100644
--- a/file_contexts
+++ b/file_contexts
@@ -12,7 +12,7 @@
 
 # Executables
 /charger		u:object_r:rootfs:s0
-/init			u:object_r:rootfs:s0
+/init			u:object_r:init_exec:s0
 /sbin(/.*)?		u:object_r:rootfs:s0
 
 # Empty directories