Create '/data/misc/weave' at the right time.

'/data' is not guaranteed to be ready at 'on boot'.

Bug: 24908523
Change-Id: I79016f56da2f48cbc2f239bec60bdc1d073d6b1c
diff --git a/weaved.rc b/weaved.rc
index 4bbf111..05594f5 100644
--- a/weaved.rc
+++ b/weaved.rc
@@ -1,4 +1,4 @@
-on boot
+on post-fs-data
     mkdir /data/misc/weaved 0700 system system
 
 service weaved /system/bin/weaved