make xmenuconfig is broken

[Jun Sun <jsun@mvista.com>]

There is an obvious typo.  

In addition, there are two SERIAL and SERIAL_CONSOLE related 
setting which should be in drivers/char/Config.in
instead of arch/mips/config-shared.in.

The following hack makes xmenuconfig work again, apparently breaking
decstation and IP22.  If nobody interested in those two machines
move the config, I will make an attempt to do so.

BTW, the symptom without the later two hacks is that you can set
SERIAL or SERIAL_CONSOLE options in xmenuconfig.

Any comments?

Jun

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