src/drivers/pc80: Remove empty struct keyboard

This is a empty struct that has propagated through the superio's & ec's
but really does nothing. Time to get rid of it before it adds yet more
cruft. However, since this touches many superio's at once we do this in
stages by first changing the function type to be a pure procedure.

Change-Id: Ibc732e676a9d4f0269114acabc92b15771d27ef2
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5617
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Rudolf Marek <r.marek@assembler.cz>

src/include/pc80/keyboard.h

@@ -5,7 +5,7 @@ struct pc_keyboard {
 	/* No initialization parameters for now */
 };
 
-void pc_keyboard_init(struct pc_keyboard *keyboard);
+void pc_keyboard_init(void);
 void set_kbc_ps2_mode(void);
 
 #endif /* PC80_KEYBOARD_H */