Add device start operation and update the correct function pointers for Rx and Tx burst functions. This patch also update the octeontx2 NIC specific documentation. Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com> Signed-off-by: Vamsi Attunuru <vattunuru@marvell.com> Signed-off-by: Jerin Jacob <jerinj@marvell.com>