Fix analytical power of contact with new hierarchy_design level introduced.

compiler/base/contact.py

@@ -158,6 +158,9 @@ class contact(hierarchy_design.hierarchy_design):
                       width=well_width,
                       height=well_height)
         
+    def analytical_power(self, proc, vdd, temp, load):
+        """ Get total power of a module  """
+        return self.return_power()
 
 
 # This is not instantiated and used for calculations only.