[LevelZero] remove intial data argument form buffer allocation

Makes the driver compliant with the HAL API change.

experimental/level_zero/level_zero_allocator.c

@@ -192,7 +192,7 @@ static void iree_hal_level_zero_buffer_free(
 static iree_status_t iree_hal_level_zero_allocator_allocate_buffer(
     iree_hal_allocator_t* IREE_RESTRICT base_allocator,
     const iree_hal_buffer_params_t* IREE_RESTRICT params,
-    iree_device_size_t allocation_size, iree_const_byte_span_t initial_data,
+    iree_device_size_t allocation_size,
     iree_hal_buffer_t** IREE_RESTRICT out_buffer) {
   iree_hal_level_zero_allocator_t* allocator =
       iree_hal_level_zero_allocator_cast(base_allocator);
@@ -267,18 +267,6 @@ static iree_status_t iree_hal_level_zero_allocator_allocate_buffer(
         /*byte_length=*/allocation_size, device_ptr, host_ptr, &buffer);
   }
 
-  // Copy the initial contents into the buffer. This may require staging.
-  if (iree_status_is_ok(status) &&
-      !iree_const_byte_span_is_empty(initial_data)) {
-    status = iree_hal_device_transfer_range(
-        allocator->base_device,
-        iree_hal_make_host_transfer_buffer_span((void*)initial_data.data,
-                                                initial_data.data_length),
-        0, iree_hal_make_device_transfer_buffer(buffer), 0,
-        initial_data.data_length, IREE_HAL_TRANSFER_BUFFER_FLAG_DEFAULT,
-        iree_infinite_timeout());
-  }
-
   if (iree_status_is_ok(status)) {
     IREE_STATISTICS(iree_hal_allocator_statistics_record_alloc(
         &allocator->statistics, compat_params.type, allocation_size));

experimental/level_zero/level_zero_device.c

@@ -340,9 +340,9 @@ static iree_status_t iree_hal_level_zero_device_queue_alloca(
   // TODO(benvanik): queue-ordered allocations.
   IREE_RETURN_IF_ERROR(iree_hal_semaphore_list_wait(wait_semaphore_list,
                                                     iree_infinite_timeout()));
-  IREE_RETURN_IF_ERROR(iree_hal_allocator_allocate_buffer(
-      iree_hal_device_allocator(base_device), params, allocation_size,
-      iree_const_byte_span_empty(), out_buffer));
+  IREE_RETURN_IF_ERROR(
+      iree_hal_allocator_allocate_buffer(iree_hal_device_allocator(base_device),
+                                         params, allocation_size, out_buffer));
   IREE_RETURN_IF_ERROR(iree_hal_semaphore_list_signal(signal_semaphore_list));
   return iree_ok_status();
 }