input: Purge AddOtherInputDevices DDX hook.

This hook wasn't used by any DDX. Device addition and removal is handled by
the config backend, so we don't need to do anything special that during the
ListInputDevices request processing.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>

hw/kdrive/src/kinput.c

@@ -2176,13 +2176,6 @@ ProcessInputEvents (void)
     KdCheckLock ();
 }
 
-/* We initialise all input devices at startup. */
-void
-AddOtherInputDevices(void)
-{
-    return;
-}
-
 /* At the moment, absolute/relative is up to the client. */
 int
 SetDeviceMode(register ClientPtr client, DeviceIntPtr pDev, int mode)