Set adbd to be disabled by default in recovery

Change-Id: I74fa6edc4b001247b20be52e8301d18407fede2c
diff --git a/etc/init.rc b/etc/init.rc
index d9e86d7..02c10a9 100644
--- a/etc/init.rc
+++ b/etc/init.rc
@@ -25,6 +25,7 @@
 service recovery /sbin/recovery
 
 service adbd /sbin/adbd recovery
+    disabled
 
 on property:persist.service.adb.enable=1
     start adbd