Add hsigmoid fusing for MO (#2750)

* Add hsigmoid fusing for MO

* Update Bom file

* Remove comments

* Refactoring hsigmoid fusion according to review

* Add div and mul patterns for hsigmoid fusion

* Refactoring code according to review

* Fix HSigmoid fusion transformation

model-optimizer/extensions/ops/activation_ops.py

@@ -248,6 +248,12 @@ class HSwish(Activation):
     operation = staticmethod(lambda x: x * np.minimum(np.maximum(x + 3.0, 0.0), 6.0) / 6.0)
 
 
+class HSigmoid(Activation):
+    op = 'HSigmoid'
+    version = 'opset5'
+    operation = staticmethod(lambda x: np.minimum(np.maximum(x + 3.0, 0.0), 6.0) / 6.0)
+
+
 class Swish(Op):
     op = 'Swish'