geneve: add initial netdev driver for GENEVE tunnels

This is an initial implementation of a netdev driver for GENEVE
tunnels.  This implementation uses a fixed UDP port, and only supports
point-to-point links with specific partner endpoints.  Only IPv4
links are supported at this time.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/Kconfig
Simple merge

diff --cc drivers/net/Makefile
Simple merge

diff --cc drivers/net/geneve.c
Simple merge

diff --cc include/uapi/linux/if_link.h
Simple merge