boards: spinx: Fix the documentation generation

Currently the template app documentation will not generate. Fix that!

Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>

wasp/boards/sphinx/watch.py

@@ -46,8 +46,13 @@ def sleep_ms(ms):
     time.sleep(ms / 1000)
 time.sleep_ms = sleep_ms
 
+class Accel():
+    def reset(self):
+        pass
+
 class Pin():
     def value(v=None):
         pass
 
+accel = Accel()
 button = Pin()