staging: Enable parport sb105x drivers if parport is configured

Some of the drivers that the sb105x SystemBase handles are for parallel
port cards. If PARPORT isn't configured, the build fails. Only
initialize the parallel port cards if PARPORT is configured in.

Reported-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>