Removes the memory allocations for user IO in WZ_DMA

This makes the memory allocations for user IO in WZ_DMA driver configurable and sets to zero for scdaq, because it is not needed. Effectively removing out of memory issues we saw recently.

src/WZDmaInputFilter.cc

@@ -19,7 +19,7 @@ WZDmaInputFilter::WZDmaInputFilter(size_t packetBufferSize,
       sconeBoard_ {conf.getSconeBoard()} {
   // Initialize the DMA subsystem
   dma_is_initialized_ = false;
-  if (wz_init(&dma_) < 0) {
+  if (wz_init(&dma_, 0) < 0) {
     std::string msg = "Cannot initialize WZ DMA device";
     if (errno == ENOENT) {
       msg +=
@@ -70,7 +70,7 @@ inline ssize_t WZDmaInputFilter::read_packet_from_dma(char **buffer) {
         dma_is_initialized_ = false;
 
         // Initialize the DMA subsystem
-        if (wz_init(&dma_) < 0) {
+        if (wz_init(&dma_, 0) < 0) {
           throw std::system_error(errno, std::system_category(),
                                   "Cannot initialize WZ DMA device");
         }