Add QASYMM8_SIGNED support to graph examples via graph mutator

Related to COMPMID-4279

Signed-off-by: SiCongLi <sicong.li@arm.com>
Change-Id: I6c737536b4e614cc9975003acca766803f55bf0b
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5206
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/examples/graph_vgg16.cpp b/examples/graph_vgg16.cpp
index 83e6637..3e453b3 100644
--- a/examples/graph_vgg16.cpp
+++ b/examples/graph_vgg16.cpp
@@ -212,12 +212,13 @@
 
         // Finalize graph
         GraphConfig config;
-        config.num_threads      = common_params.threads;
-        config.use_tuner        = common_params.enable_tuner;
-        config.tuner_mode       = common_params.tuner_mode;
-        config.tuner_file       = common_params.tuner_file;
-        config.mlgo_file        = common_params.mlgo_file;
-        config.convert_to_uint8 = (common_params.data_type == DataType::QASYMM8);
+        config.num_threads        = common_params.threads;
+        config.use_tuner          = common_params.enable_tuner;
+        config.tuner_mode         = common_params.tuner_mode;
+        config.tuner_file         = common_params.tuner_file;
+        config.mlgo_file          = common_params.mlgo_file;
+        config.use_synthetic_type = arm_compute::is_data_type_quantized(common_params.data_type);
+        config.synthetic_type     = common_params.data_type;
 
         graph.finalize(common_params.target, config);