Remove `start vold` action from post-fs-data

vold is already started during early-fs which happens before
post-fs-data.

Trying to start it again in post-fs-data is a little bit confusing.

Test: device boots
Change-Id: I5faefe6d1f1bb7472ea3d032b1f157c69da565f1
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 0d3d4db..58db96c 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -445,7 +445,6 @@
     mark_post_data
 
     # Start checkpoint before we touch data
-    start vold
     exec - system system -- /system/bin/vdc checkpoint prepareCheckpoint
 
     # We chown/chmod /data again so because mount is run as root + defaults