[SYCL] Add mock PI buffer copy stubs

Author: Bensuo

sycl/unittests/helpers/PiMockPlugin.hpp

@@ -1183,6 +1183,26 @@ inline pi_result mock_piextEnqueueCommandBuffer(
   return PI_SUCCESS;
 }
 
+inline pi_result mock_piextCommandBufferMemBufferCopy(
+    pi_ext_command_buffer command_buffer, pi_mem src_buffer, pi_mem dst_buffer,
+    size_t src_offset, size_t dst_offset, size_t size,
+    pi_uint32 num_sync_points_in_wait_list,
+    const pi_ext_sync_point *sync_point_wait_list,
+    pi_ext_sync_point *sync_point) {
+  return PI_SUCCESS;
+}
+
+inline pi_result mock_piextCommandBufferMemBufferCopyRect(
+    pi_ext_command_buffer command_buffer, pi_mem src_buffer, pi_mem dst_buffer,
+    pi_buff_rect_offset src_origin, pi_buff_rect_offset dst_origin,
+    pi_buff_rect_region region, size_t src_row_pitch, size_t src_slice_pitch,
+    size_t dst_row_pitch, size_t dst_slice_pitch,
+    pi_uint32 num_sync_points_in_wait_list,
+    const pi_ext_sync_point *sync_point_wait_list,
+    pi_ext_sync_point *sync_point) {
+  return PI_SUCCESS;
+}
+
 inline pi_result mock_piTearDown(void *PluginParameter) { return PI_SUCCESS; }
 
 inline pi_result mock_piPluginGetLastError(char **message) {