Rename quantized data types to remove ambiguity for signed/unsigned payloads

!android-nn-driver:2572

Change-Id: I8fe52ceb09987b3d05c539409510f535165455cc
Signed-off-by: Derek Lamberti <derek.lamberti@arm.com>
diff --git a/tests/ImageTensorGenerator/ImageTensorGenerator.hpp b/tests/ImageTensorGenerator/ImageTensorGenerator.hpp
index b1cb5e3..4793f82 100644
--- a/tests/ImageTensorGenerator/ImageTensorGenerator.hpp
+++ b/tests/ImageTensorGenerator/ImageTensorGenerator.hpp
@@ -60,7 +60,7 @@
                 case armnn::DataType::Signed32:
                     normParams.mean = { 128.0, 128.0, 128.0 };
                     break;
-                case armnn::DataType::QuantisedAsymm8:
+                case armnn::DataType::QAsymmU8:
                 default:
                     break;
             }