[build] Use REQUIRE_OBJECT() to drag in per-object configuration

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

src/net/infiniband.c

@@ -999,5 +999,8 @@ struct ib_device * last_opened_ibdev ( void ) {
 	return ibdev;
 }
 
+/* Drag in Infiniband configuration */
+REQUIRE_OBJECT ( config_infiniband );
+
 /* Drag in IPoIB */
 REQUIRE_OBJECT ( ipoib );