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/armnn/Network.cpp b/src/armnn/Network.cpp
index 1406160..554e2e2 100644
--- a/src/armnn/Network.cpp
+++ b/src/armnn/Network.cpp
@@ -101,7 +101,7 @@
     for (unsigned int i = 0; i < numOutputs; i++) {
         OutputSlot& outputSlot = layer->GetOutputSlot(i);
         TensorInfo info = outputSlot.GetTensorInfo();
-        if (DataType::QuantisedAsymm8 == info.GetDataType()) {
+        if (DataType::QAsymmU8 == info.GetDataType()) {
             if (0.f == info.GetQuantizationScale()) {
                 noErrors = false;
                 std::stringstream ss;