net/mlx5e: Add local loopback counter to vport rep stats

Add counter for number of unicast, multicast and broadcast packets/
octets that were loopback.

Signed-off-by: Or Har-Toov <ohartoov@nvidia.com>
Reviewed-by: Patrisious Haddad <phaddad@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>