net/mlx5: Fix query_nic_sys_image_guid() error during init

vport system image guid should be queried using vport nic API for
Ethernet ports, and vport hca API for Infiniband ports.

Fixes: fadd59fc ("net/mlx5: Introduce inter-device communication mechanism")
Signed-off-by: Aviv Heller <avivh@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>