vxge: Remove unnecessary include of <linux/pci_hotplug.h>

The vxge driver doesn't need anything provided by pci_hotplug.h, so remove
the unnecessary include of it.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Jon Mason <jdmason@kudzu.us>
Signed-off-by: David S. Miller <davem@davemloft.net>