Remove unneeded recovery.fstab.2

With symlinked /dev/block/loop0 to $SYSTEMDEV and $HIDDENDEV to
$CACHEDEV, no need a special recovery.fstab anymore

Change-Id: I3b1292d4fe92b51394260287091590fb7e8dfef0
Remove auto format feature

With autogenerated fstab in boot image, no need auto format /cache
partition anymore

Change-Id: Ic94407b633357ec09fdee95ef6cecb8add5036b6
Increase sparse system.img to 2 GB

Change-Id: I6f698b4c023890d3ac9c9b058de481dc45f119b5