Add TKDNN_MODE variable to the name of the network.

This commit permits to obtain different .rt files for different
precision optimizations of the same network.

Signed-off-by: Davide Sapienza <sapienza.dav@gmail.com>

tests/yolo_tiny/yolo_tiny.cpp

@@ -62,7 +62,7 @@ int main() {
     net.print();
 
     //convert network to tensorRT
-    tk::dnn::NetworkRT netRT(&net, "yolo_tiny.rt");
+    tk::dnn::NetworkRT netRT(&net, net.getNetworkRTName("yolo_tiny"));
 
     dnnType *out_data, *out_data2; // cudnn output, tensorRT output