ceph-volume: set lvm membership for mpath type devices

ceph-volume: set lvm membership for mpath type devices

If any lvs is present, self.lvs should be set accordingly for mpath
type devices as well.
Otherwise, when re-running a command like following:

```
ceph-volume lvm batch --bluestore --no-auto  /dev/mapper/mpatha /dev/mapper/mpathb
```

fails with error : "Device /dev/mapper/mpatha has a filesystem."

where the expected behavior is:

```
--> passed data devices: 2 physical, 0 LVM
--> relative data size: 1.0
--> All data devices are unavailable

Total OSDs: 0

  Type            Path                                                    LV Size         % of device
```

Fixes: https://tracker.ceph.com/issues/61673
Signed-off-by: Guillaume Abrioux <gabrioux@ibm.com>