acer-wmi: set the touchpad toggle key code to KEY_TOUCHPAD_TOGGLE

Set the touchpad toggle key code from F22 to KEY_TOUCHPAD_TOGGLE,
and userspace should use udev's key re-mapping facilities while X
is unable to process keycodes above 255 to adjust to the keycode.

Cc: Matthew Garrett <mjg@redhat.com>
Cc: Dmitry Torokhov <dtor@mail.ru>
Cc: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: NLee, Chun-Yi <jlee@novell.com>
Signed-off-by: NMatthew Garrett <mjg@redhat.com>

drivers/platform/x86/acer-wmi.c

@@ -108,7 +108,7 @@ static const struct key_entry acer_wmi_keymap[] = {
 	{KE_KEY, 0x23, {KEY_PROG3} },    /* P_Key */
 	{KE_KEY, 0x24, {KEY_PROG4} },    /* Social networking_Key */
 	{KE_KEY, 0x64, {KEY_SWITCHVIDEOMODE} },	/* Display Switch */
-	{KE_KEY, 0x82, {KEY_F22} },      /* Touch Pad On/Off */
+	{KE_KEY, 0x82, {KEY_TOUCHPAD_TOGGLE} },	/* Touch Pad On/Off */
 	{KE_END, 0}
 };