Add the name of the device's driver to the hotplug environment of class
and block devices.

  ACTION=add
  DEVPATH=/block/sda
  SUBSYSTEM=block
  SEQNUM=986
  PHYSDEVPATH=/devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/host0/target0:0:0/0:0:0:0
  PHYSDEVBUS=scsi
  PHYSDEVDRIVER=sd
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>