Define policy for "loop-control" device.

Per loop(4), this device is the preferred way of allocating new
loop devices since Linux 3.1.

avc: denied { read write } for name="loop-control" dev="tmpfs" ino=15221 scontext=u:r:vold:s0 tcontext=u:object_r:device:s0 tclass=chr_file permissive=0

Bug: 34903607
Change-Id: I1f5f62cf0a1c24c6f6453100004812af4b8e1503
diff --git a/private/file_contexts b/private/file_contexts
index d5cf3f7..bd111b8 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -92,6 +92,7 @@
 /dev/keychord   u:object_r:keychord_device:s0
 /dev/kmem		u:object_r:kmem_device:s0
 /dev/log(/.*)?		u:object_r:log_device:s0
+/dev/loop-control	u:object_r:loop_control_device:s0
 /dev/mem		u:object_r:kmem_device:s0
 /dev/modem.*		u:object_r:radio_device:s0
 /dev/mtd(/.*)?		u:object_r:mtd_device:s0