[coreboot] libpayload: Support curses for serial

[Jordan Crouse]

Support curses over serial.  Tested with coreinfo over qemu, looks good.
I'm not sure what will happen when we actually get in front of a real
terminal emulator, but thats part of the fun.

Jordan
-- 
Jordan Crouse
Systems Software Development Engineer 
Advanced Micro Devices, Inc.
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