[init] start gatekeeperd after device decryption

gatekeeperd depends on having /data to determine whether
to call setup routines for qcom HALs.

Bug: 22298552
Change-Id: I6c552016dc863bbb04bd5a949a2317a720c8263f
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 3353c64..7af2b77 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -639,7 +639,7 @@
     oneshot
 
 service gatekeeperd /system/bin/gatekeeperd /data/misc/gatekeeper
-    class main
+    class late_start
     user system
 
 service installd /system/bin/installd