[IRDA] DONGLE_OLD: remove dependency on non-existing symbol

Jean-Luc Leger <reiga@dspnet.fr.eu.org> reported this alternative 
dependency on a non-existing symbol.
Signed-off-by: NAdrian Bunk <bunk@stusta.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/irda/Kconfig

-
 menu "Infrared-port device drivers"
 	depends on IRDA!=n
 
@@ -156,7 +155,7 @@ comment "Old Serial dongle support"
 
 config DONGLE_OLD
 	bool "Old Serial dongle support"
-	depends on (IRTTY_OLD || IRPORT_SIR) && BROKEN_ON_SMP
+	depends on IRPORT_SIR && BROKEN_ON_SMP
 	help
 	  Say Y here if you have an infrared device that connects to your
 	  computer's serial port. These devices are called dongles. Then say Y