ggml : add support for dynamic loading of backends (#10469)

* ggml : add support for dynamic loading of backends

---------

Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>

examples/simple/simple.cpp

@@ -74,6 +74,10 @@ int main(int argc, char ** argv) {
         }
     }
 
+    // load dynamic backends
+
+    ggml_backend_load_all();
+
     // initialize the model
 
     llama_model_params model_params = llama_model_default_params();