CONFIG_SERIAL_CONSOLE in v2.1.31

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First off, thanks to whoever did the console work in v2.1.31 -- it saves between 50 and 60k on a headless box by dumping selection, console, keyboard and friends from the kernel. Good stuff.

My only minor gripe is that you still can't select the serial port without having to locate and edit some #define buried in some file. This can either be addressed via a boot time argument or as a CONFIG option. The latter is probably an adequate solution, and what the following patch implements via the "choice" configure function (same as how you select your CPU on i386 builds).