net/mlx5e: Move devlink-health rx and tx reporters to devlink port

Utilize new devlink-health port reporters API to move rx and tx
reporters from device to port.

Signed-off-by: Vladyslav Tarasiuk <vladyslavt@mellanox.com>
Reviewed-by: Moshe Shemesh <moshe@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>