rdma: Report device protocol

rdma: Report device protocol

Add support for reporting the device protocol.

11: mlx5_0: node_type ca protocol roce fw 12.28.2006
    node_guid 248a:0703:004b:f094 sys_image_guid 248a:0703:004b:f094
12: mlx5_1: node_type ca protocol ib fw 12.28.2006
    node_guid 248a:0703:0049:d4f0 sys_image_guid 248a:0703:0049:d4f0
13: mlx5_2: node_type ca protocol ib fw 12.28.2006
    node_guid 248a:0703:0049:d4f1 sys_image_guid 248a:0703:0049:d4f0
19: siw0: node_type rnic protocol iw node_guid 0200:00ff:fe00:0000
    sys_image_guid 0200:00ff:fe00:0000

Signed-off-by: Kamal Heib <kheib@redhat.com>
Acked-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: David Ahern <dsahern@kernel.org>