COMPMID-1246 Fix mobilenet QASYMM8 on CL

Change-Id: I504ea1b39354befa46b8b3288c2a9d6639d63ee1
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/146035
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
diff --git a/src/graph/GraphBuilder.cpp b/src/graph/GraphBuilder.cpp
index 81a18c4..f2eca67 100644
--- a/src/graph/GraphBuilder.cpp
+++ b/src/graph/GraphBuilder.cpp
@@ -327,7 +327,13 @@
     {
         TensorDescriptor b_desc = input_tensor_desc;
         b_desc.shape            = TensorShape(get_dimension_size(input_tensor_desc, DataLayoutDimension::CHANNEL));
-        b_nid                   = add_const_node_with_name(g, params, "Bias", b_desc, std::move(bias_accessor));
+
+        if(is_data_type_quantized_asymmetric(b_desc.data_type))
+        {
+            b_desc.data_type = DataType::S32;
+        }
+
+        b_nid = add_const_node_with_name(g, params, "Bias", b_desc, std::move(bias_accessor));
     }
 
     // Create convolution node and connect