Add sum to backend hpp

Author: qnixsynapse

ggml/src/ggml-sycl/backend.hpp

@@ -38,6 +38,7 @@
 #include "scale.hpp"
 #include "clamp.hpp"
 #include "pool2d.hpp"
+#include "sum.hpp"
 #include "gla.hpp"
 
 #endif // GGML_SYCL_BACKEND_HPP