thunderbolt: Only configure USB4 wake for lane 0 adapters

Only USB4 lane 0 adapter has the USB4 port capability for wakes so only
program wakes on such adapters.

Fixes: b2911a59 ("thunderbolt: Enable wakes from system suspend")
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

drivers/thunderbolt/usb4.c

@@ -421,8 +421,12 @@ int usb4_switch_set_wake(struct tb_switch *sw, unsigned int flags)
 	 * upstream USB4 port.
 	 */
 	tb_switch_for_each_port(sw, port) {
+		if (!tb_port_is_null(port))
+			continue;
 		if (!route && tb_is_upstream_port(port))
 			continue;
+		if (!port->cap_usb4)
+			continue;
 
 		ret = tb_port_read(port, &val, TB_CFG_PORT,
 				   port->cap_usb4 + PORT_CS_19, 1);