[DPDK] Enable VT-d in kernel via grub in case vfio-pci PMD driver

This is required in order to use vfio-pci driver.
More info: http://docs.openvswitch.org/en/latest/intro/install/dpdk/

Change-Id: I1c936ffd4a903b9c6d67cdde6c612019a85f9b9e
5 files changed