platform/x86: hp-wmi: Support touchpad on/off

Add scancodes reported by the touchpad on/off button. The actual disabling
and enabling is done in hardware, and this just reports that change to
userspace.
Signed-off-by: Daniel Houldsworth <dhould3@gmail.com>
Link: https://lore.kernel.org/r/20220922115459.6511-1-dhould3@gmail.comReviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/hp-wmi.c

@@ -215,6 +215,8 @@ static const struct key_entry hp_wmi_keymap[] = {
 	{ KE_KEY, 0x213b,  { KEY_INFO } },
 	{ KE_KEY, 0x2169,  { KEY_ROTATE_DISPLAY } },
 	{ KE_KEY, 0x216a,  { KEY_SETUP } },
+	{ KE_KEY, 0x21a9,  { KEY_TOUCHPAD_OFF } },
+	{ KE_KEY, 0x121a9, { KEY_TOUCHPAD_ON } },
 	{ KE_KEY, 0x231b,  { KEY_HELP } },
 	{ KE_END, 0 }
 };