[hermon] Set event queue number for completion queues

Give completion queues a chance to deliver exception events by
programming in the number of our event queue (currently used only for
port state changes).

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

src/drivers/infiniband/hermon.c

 	MLX_FILL_2 ( &cqctx, 3,
 		     usr_page, HERMON_UAR_NON_EQ_PAGE,
 		     log_cq_size, fls ( cq->num_cqes - 1 ) );
+	MLX_FILL_1 ( &cqctx, 5, c_eqn, hermon->eq.eqn );
 	MLX_FILL_1 ( &cqctx, 7, mtt_base_addr_l,
 		     ( hermon_cq->mtt.mtt_base_addr >> 3 ) );
 	MLX_FILL_1 ( &cqctx, 15, db_record_addr_l,