Ethernet NIC driver for VMware's vmxnet3

From: Shreyas Bhatewara <sbhatewara@vmware.com>

This patch adds driver support for VMware's virtual Ethernet NIC: vmxnet3
Guests running on VMware hypervisors supporting vmxnet3 device will thus have
access to improved network functionalities and performance.
Signed-off-by: NShreyas Bhatewara <sbhatewara@vmware.com>
Signed-off-by: NBhavesh Davda <bhavesh@vmware.com>
Signed-off-by: NRonghua Zhang <ronghua@vmware.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>