[SERIAL] PARPORT_SERIAL should depend on SERIAL_8250_PCI

Since parport_serial uses symbols from 8250_pci, there should
be a dependency between the configuration symbols for these
two modules.  Problem reported by Andrey Borzenkov

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/parport/Kconfig

@@ -48,7 +48,7 @@ config PARPORT_PC
 
 config PARPORT_SERIAL
 	tristate "Multi-IO cards (parallel and serial)"
-	depends on SERIAL_8250 && PARPORT_PC && PCI
+	depends on SERIAL_8250_PCI && PARPORT_PC && PCI
 	help
 	  This adds support for multi-IO PCI cards that have parallel and
 	  serial ports.  You should say Y or M here.  If you say M, the module