Add a /bin symlink for convenience.

Bug: http://b/63142920
Test: `make dist`
Change-Id: Iae363fd5e7181941408d3d75cbf248e651bc8b49
diff --git a/private/file_contexts b/private/file_contexts
index 5598bf3..4e94400 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -31,6 +31,7 @@
 /sys                u:object_r:sysfs:s0
 
 # Symlinks
+/bin                u:object_r:rootfs:s0
 /bugreports         u:object_r:rootfs:s0
 /d                  u:object_r:rootfs:s0
 /etc                u:object_r:rootfs:s0