switch to unified fstab

* Add entries for the sdcards to fstab.p1 and drop vold.fstab

Change-Id: I7193bf588440331ba690caf16f6ac12d850e0ead
drop recovery.fstab, and use fstab.p1 for recovery instead

Change-Id: Icc0871aa4ad1856bc6252c904b4b96a36b6cdb0b
fstab: drop the recoveryonly storage entries

* Not needed anymore, now that we have vold in recovery.

Change-Id: Iad494e8015f4a3de5f7a6f4c1553360d914d3854