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/src/armnnSerializer/Serializer.cpp b/src/armnnSerializer/Serializer.cpp
index 608a9c3..be6fa64 100644
--- a/src/armnnSerializer/Serializer.cpp
+++ b/src/armnnSerializer/Serializer.cpp
@@ -1405,7 +1405,7 @@
             fbPayload = flatBuffersData.o;
             break;
         }
-        case armnn::DataType::QuantisedSymm16:
+        case armnn::DataType::QSymmS16:
         {
             auto fbVector = CreateDataVector<int16_t>(constTensor.GetMemoryArea(), constTensor.GetNumBytes());
             flatbuffers::Offset<serializer::ShortData> flatBuffersData = serializer::CreateShortData(
@@ -1414,7 +1414,7 @@
             fbPayload = flatBuffersData.o;
             break;
         }
-        case armnn::DataType::QuantisedAsymm8:
+        case armnn::DataType::QAsymmU8:
         case armnn::DataType::Boolean:
         default:
         {