serial: fix vr41xx_siu interface select

only PORT_VR41XX_SIU can select interface.
Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/serial/vr41xx_siu.c

@@ -800,6 +800,7 @@ static int __init siu_console_setup(struct console *con, char *options)
 		port->membase = ioremap(port->mapbase, siu_port_size(port));
 	}
 
+	if (port->type == PORT_VR41XX_SIU)
 		vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
 
 	if (options != NULL)