set permissions of recovery install script

The script that writes the recovery partition after a successful
update of system needs to be made executable.  This change also moves
it from /system/etc to /system/bin.

Bug: 12893978
Change-Id: I686e2392a2392515a6859a7381b735de1007b7ea
diff --git a/rootdir/init.rc b/rootdir/init.rc
index dc260e6..e8837a3 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -536,7 +536,7 @@
     class main
     socket installd stream 600 system system
 
-service flash_recovery /system/etc/install-recovery.sh
+service flash_recovery /system/bin/install-recovery.sh
     class main
     oneshot