net: typhoon: include <net/vxlan.h>

We need this to get vxlan_features_check() definition.

Fixes: d2692eee ("net: typhoon: implement ndo_features_check method")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20220208003502.1799728-1-eric.dumazet@gmail.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>