- unify keycodes for non-ASCII keys by using curses' codes and labels

- unify keycodes for non-ASCII keys by using curses' codes and labels
- fix ctrl-[a-z]
- get rid of curses' ps/2 driver. uses generic one instead
- #ifdef's around ps/2 keyboard handling and serial handling
- add alt-key handling (necessary for german keymap)
- flush keyboard controller buffer on init

Signed-off-by: Patrick Georgi <patrick.georgi@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3580 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1