StimProducer: add destroyAttachedStimulusBuffer virtual method

Implemented in base class and in derived class
PcloudStimulusProducer.

stimBuffApis/livoxGen1/pcloudStimulusProducer.h

@@ -70,6 +70,9 @@ public:
 		const std::shared_ptr<device::DeviceAttachmentSpec>& spec)
 		const override;
 
+	void destroyAttachedStimulusBuffer(
+		const std::shared_ptr<StimulusBuffer>& buffer) override;
+
 protected:
 	void stimFrameProductionTimesliceInd() override;