OClCollMeshEngn: collBuff only needs MAP_WRITE; silence dbg prints

When mapping in the collationBuff we only need to supply CL_MAP_WRITE
and not CL_MAP_WRITE_INVALIDATE_REGION since we don't care to
preserve the contents of the collation buff as input to the
collation kernel.

stimBuffApis/livoxGen1/collateDgrams.cl

@@ -1,5 +1,5 @@
 // Debug macro: define DEBUG_COLLATE_DGRAMS to enable printf statements
-#define DEBUG_COLLATE_DGRAMS
+// #define DEBUG_COLLATE_DGRAMS
 #ifdef DEBUG_COLLATE_DGRAMS
 #define DBG_PRINTF(...) printf(__VA_ARGS__)
 #else
@@ -49,6 +49,7 @@ __kernel void collate(
 	// Each PointXYZI is 4 floats (x, y, z, intensity)
 	#define FLOATS_PER_POINT 4
 	uint collationBaseOffset = slotIndex * nPointsPerSlot * FLOATS_PER_POINT;
+	DBG_PRINTF("Running kernel: about to process points in slot.\n");
 
 	// Process based on data type using nested ifs (outer) with loops (inner)
 	if (dataType == 0)

stimBuffApis/livoxGen1/openClCollatingAndMeshingEngine.cpp

@@ -342,7 +342,7 @@ bool OpenClCollatingAndMeshingEngine::startCollateKernel(
 
 	mapAssemblyBuffer(CL_MAP_WRITE_INVALIDATE_REGION);
 	unmapAssemblyBuffer();
-	mapCollationBuffer(CL_MAP_WRITE_INVALIDATE_REGION);
+	mapCollationBuffer(CL_MAP_WRITE);
 	unmapCollationBuffer();
 
 	// Validate buffers callable