ggml-zdnn: implement at least 1 op to test

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

ggml/src/ggml-zdnn/ggml-zdnn-rewrite.cpp

@@ -10,6 +10,10 @@
 
 static bool ggml_backend_zdnn_compute_forward(struct ggml_backend_zdnn_context * ctx, struct ggml_tensor * dst) {
     switch (dst->op) {
+        case GGML_OP_MUL_MAT:
+            {
+                std::raise(SIGINT);
+            } break;
         default:
             return false;
     }
@@ -154,6 +158,9 @@ static bool ggml_zdnn_supports_op(const struct ggml_backend_zdnn_device_context
         case GGML_OP_CONCAT:
             return true;
 
+        case GGML_OP_MUL_MAT:
+            return true;
+
         default:
             return false;
     }