Update unified fstab.latona to support recovery
Add entries to the unified fstab needed by recovery.
Also, copy the unified fstab to /etc/recovery.fstab in the recovery
ramdisk.

Signed-off-by: David Rodero <david@codiguiel.net>
recovery: Set RECOVERY_FSTAB_VERSION
On latona we now use the new recovery.fstab format, set
RECOVERY_FSTAB_VERSION=2 to indicate this.

Signed-off-by: David Rodero <david@codiguiel.net>