[IE][VPU]: allocate maximum shaves for mish activation (#1995)

* Mish activation calculation costs more time than memory copy, so
allocate more shaves mish activation.

Co-authored-by: Jiang, Renzhi <renzhi.jiang@intel.com>

inference-engine/src/vpu/graph_transformer/src/stages/mish.cpp

@@ -20,6 +20,10 @@ private:
 
     void serializeParamsImpl(BlobSerializer&) const override {
     }
+
+    StageSHAVEsRequirements getSHAVEsRequirementsImpl() const override {
+        return StageSHAVEsRequirements::NeedMax;
+    }
 };
 
 }  // namespace