RDMA/efa: Split hardware stats to device and port stats

The hardware stats API distinguishes between device and port statistics,
split the EFA stats accordingly instead of always dumping everything.

Link: https://lore.kernel.org/r/20210712105923.17389-1-galpress@amazon.com


Reviewed-by: Firas JahJah <firasj@amazon.com>
Reviewed-by: Yossi Leybovich <sleybo@amazon.com>
Signed-off-by: Gal Pressman <galpress@amazon.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>