IVGCVSW-2971 Support QSymm16 for DetectionPostProcess workloads

Signed-off-by: Aron Virginas-Tar <Aron.Virginas-Tar@arm.com>
Change-Id: I8af45afe851a9ccbf8bce54727147fcd52ac9a1f
diff --git a/src/backends/reference/backend.mk b/src/backends/reference/backend.mk
index 81b6de1..edf1431 100644
--- a/src/backends/reference/backend.mk
+++ b/src/backends/reference/backend.mk
@@ -37,8 +37,7 @@
         workloads/RefDebugWorkload.cpp \
         workloads/RefDepthwiseConvolution2dWorkload.cpp \
         workloads/RefDequantizeWorkload.cpp \
-        workloads/RefDetectionPostProcessFloat32Workload.cpp \
-        workloads/RefDetectionPostProcessUint8Workload.cpp \
+        workloads/RefDetectionPostProcessWorkload.cpp \
         workloads/RefElementwiseWorkload.cpp \
         workloads/RefFakeQuantizationFloat32Workload.cpp \
         workloads/RefFloorWorkload.cpp \