thunderbolt: There are only 5 basic router registers in pre-USB4 routers

Intel pre-USB4 routers only have ROUTER_CS_0 up to ROUTER_CS_4 and it
immediately follows the TMU router registers. Correct this accordingly.

Reported-by: Rajaram Regupathy <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>

Author: westeri

drivers/thunderbolt/debugfs.c

@@ -1346,7 +1346,7 @@ static int switch_basic_regs_show(struct tb_switch *sw, struct seq_file *s)
 	if (tb_switch_is_usb4(sw))
 		dwords = ARRAY_SIZE(data);
 	else
-		dwords = 7;
+		dwords = 5;
 
 	ret = tb_sw_read(sw, data, TB_CFG_SWITCH, 0, dwords);
 	if (ret)