[infiniband] Retrieve GID flag from cached path entries

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/net/infiniband/ib_pathrec.c

 		av->lid = cached->path->av.lid;
 		av->rate = cached->path->av.rate;
 		av->sl = cached->path->av.sl;
+		av->gid_present = cached->path->av.gid_present;
 		DBGC2 ( ibdev, "IBDEV %s cache hit for " IB_GID_FMT "\n",
 			ibdev->name, IB_GID_ARGS ( gid ) );
 		return 0;