Staging: sb105x: mark it BROKEN

It isn't using the port logic, and breaks the build at the moment, so
mark it BROKEN.

Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/sb105x/Kconfig

 config SB105X
 	tristate "SystemBase PCI Multiport UART"
 	select SERIAL_CORE
-	depends on PCI
+	depends on PCI && BROKEN
 	help
 	  A driver for the SystemBase Multi-2/PCI serial card