iw_cxgb4: remove wr_id attributes

Remove sq/rq wr_id attributes because typically they are pointers and
we don't want to pass up kernel pointers.

Fixes: 056f9c7f ("iw_cxgb4: dump detailed driver-specific QP information")
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>