StagingBuff: support both Mlock & IOUring pin; Use in IoUAssmEngn

We use io_uring_register_buffers() for IoUringAssemblyEngine instead
of using mlock(). This __appears__ to have reduced CPU utilization on
the Dell laptop. Could also be that we recently upgraded total RAM
from 8GiB to 32GiB.

stimBuffApis/livoxGen1/pcloudAmbienceStimulusBuffer.h

@@ -73,11 +73,11 @@ public:
 
 	~PcloudAmbienceStimulusBuffer() = default;
 
-	// Non-copyable, movable
+	// Non-copyable, non-movable: inherited pinner lifetime is instance-bound
 	PcloudAmbienceStimulusBuffer(const PcloudAmbienceStimulusBuffer&) = delete;
 	PcloudAmbienceStimulusBuffer& operator=(const PcloudAmbienceStimulusBuffer&) = delete;
-	PcloudAmbienceStimulusBuffer(PcloudAmbienceStimulusBuffer&&) = default;
-	PcloudAmbienceStimulusBuffer& operator=(PcloudAmbienceStimulusBuffer&&) = default;
+	PcloudAmbienceStimulusBuffer(PcloudAmbienceStimulusBuffer&&) = delete;
+	PcloudAmbienceStimulusBuffer& operator=(PcloudAmbienceStimulusBuffer&&) = delete;
 
 public:
 	uint32_t postrinInterestPercentage;