Init: add OTA directory

Add /data/ota in init so that the right selinux labels are applied.

Bug: 25612095
Change-Id: I8fd093147f8e0a5c3bd1a4007a61b0b759911cf2
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 441f28b..2c81dcb 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -371,6 +371,8 @@
 
     # create dalvik-cache, so as to enforce our permissions
     mkdir /data/dalvik-cache 0771 root root
+    # create the A/B OTA directory, so as to enforce our permissions
+    mkdir /data/ota 0771 root root
 
     # create resource-cache and double-check the perms
     mkdir /data/resource-cache 0771 system system