Input: logips2pp - add model 1 information

It turns out I had an old 2-button Logitech mouse that responds
to Logitech's queries with model of 1.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/mouse/logips2pp.c

@@ -200,6 +200,7 @@ static void ps2pp_disconnect(struct psmouse *psmouse)
 static const struct ps2pp_info *get_model_info(unsigned char model)
 {
 	static const struct ps2pp_info ps2pp_list[] = {
+		{  1,	0,			0 },	/* Simple 2-button mouse */
 		{ 12,	0,			PS2PP_SIDE_BTN},
 		{ 13,	0,			0 },
 		{ 15,	PS2PP_KIND_MX,					/* MX1000 */