IVGCVSW-4211 Add Signed 8 bit Quantisation support into the Reference backend

!android-nn-driver:2435

Signed-off-by: Finn Williams <Finn.Williams@arm.com>
Change-Id: I10ecd4a8937725953396805f33a3562a5384c4d4
diff --git a/src/backends/reference/workloads/Decoders.hpp b/src/backends/reference/workloads/Decoders.hpp
index b9cd7f9..9d41c9e 100644
--- a/src/backends/reference/workloads/Decoders.hpp
+++ b/src/backends/reference/workloads/Decoders.hpp
@@ -105,6 +105,13 @@
         {
             return MakeSigned32Decoder(info, data);
         }
+        case DataType::QSymmS8:
+        {
+            return std::make_unique<QSymmS8Decoder>(
+            static_cast<const int8_t*>(data),
+            info.GetQuantizationScale(),
+            info.GetQuantizationOffset());
+        }
         default:
         {
             BOOST_ASSERT_MSG(false, "Unsupported Data Type!");