vmxnet3: fix cksum offload issues for tunnels with non-default udp ports

vmxnet3: fix cksum offload issues for tunnels with non-default udp ports

Commit dacce2be3312 ("vmxnet3: add geneve and vxlan tunnel offload
support") added support for encapsulation offload. However, the inner
offload capability is to be restricted to UDP tunnels with default
Vxlan and Geneve ports.

This patch fixes the issue for tunnels with non-default ports using
features check capability and filtering appropriate features for such
tunnels.

Fixes: dacce2be3312 ("vmxnet3: add geneve and vxlan tunnel offload support")
Signed-off-by: Ronak Doshi <doshir@vmware.com>
Acked-by: Guolin Yang <gyang@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>