acer-wmi: add Aspire 5741G touchpad toggle key

Add Aspire 5741G KEY_TOUCHPAD_TOGGLE to wmi keymap, preventing
"acer_wmi: Unknown key number - 0x85" error.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index 44f62b2..afed701 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -129,6 +129,7 @@
 	{KE_KEY, KEY_TOUCHPAD_ON, {KEY_TOUCHPAD_ON} },
 	{KE_KEY, KEY_TOUCHPAD_OFF, {KEY_TOUCHPAD_OFF} },
 	{KE_IGNORE, 0x83, {KEY_TOUCHPAD_TOGGLE} },
+	{KE_KEY, 0x85, {KEY_TOUCHPAD_TOGGLE} },
 	{KE_END, 0}
 };