[MLU] add mlu's missing "APPEND ${fake_kernels_src_list}" in lite.cmake (#3379)

[MLU] add mlu's missing "APPEND ${fake_kernels_src_list}" in lite.cmake

cmake/lite.cmake

@@ -381,6 +381,9 @@ function(add_kernel TARGET device level)
     endif()
     if ("${device}" STREQUAL "MLU")
         if (NOT LITE_WITH_MLU)
+            foreach(src ${args_SRCS})
+                file(APPEND ${fake_kernels_src_list} "${CMAKE_CURRENT_SOURCE_DIR}/${src}\n")
+            endforeach()
             return()
         endif()
         set(mlu_kernels "${mlu_kernels};${TARGET}" CACHE INTERNAL "")