input: Support the German keymap

Add support for the German keymap, taken from i8042.c. This can be selected
when the input library it initialised.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

board/kosagi/novena/novena.c

@@ -88,7 +88,7 @@ int drv_keyboard_init(void)
 		debug("%s: Cannot set up input\n", __func__);
 		return -1;
 	}
-	input_add_tables(&button_input);
+	input_add_tables(&button_input, false);
 	button_input.read_keys = novena_gpio_button_read_keys;
 
 	error = input_stdio_register(&dev);