Support specific disk names for block device about csi-driver-lvm

[mwennrich]

The whole point of this driver is to use logical volumes, not raw disks.
Besides that, if you want to use a whole disk as block device in a pod, it's probably easier to hostpath-mount /dev into the pod and use that device directly.

[leanenkaa]

By the way this driver support block devices and what I suggest to add options to mount those devices as folders in pod and to specify the same as for LVM which physical drive we want to use.