IB/core: Remove unused struct ib_device.flags member

Avoid confusion about what it might mean, since it's never initialized.

Signed-off-by: Roland Dreier <[e-mail]>

include/rdma/ib_verbs.h

···
 	int                          *pkey_tbl_len;
 	int                          *gid_tbl_len;
 
-	u32                           flags;
-
 	int			      num_comp_vectors;
 
 	struct iw_cm_verbs	     *iwcm;