serial: 8250_pci: remove exar code

Remove the Exar specific codes from 8250_pci and blacklist those chips
so that the new Exar serial driver binds to the devices.
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/Kconfig

@@ -130,6 +130,7 @@ config SERIAL_8250_PCI
 config SERIAL_8250_EXAR
         tristate "8250/16550 PCI device support"
         depends on SERIAL_8250_PCI
+	default SERIAL_8250
 
 config SERIAL_8250_HP300
 	tristate