There's no reason to separate the network attributes from all other
device attributes. Embed the fields inside the device attributes and
query them all in one function.

Link: https://lore.kernel.org/r/20191121141509.59297-2-galpress@amazon.comReviewed-by: NDaniel Kranzdorf <dkkranzd@amazon.com>
Reviewed-by: NYossi Leybovich <sleybo@amazon.com>
Signed-off-by: NGal Pressman <galpress@amazon.com>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>