IVGCVSW-2247 Adding a min Elementwise Workload and tests

Change-Id: I017ca6c23b62a8978982de0ca4ad204cb8cf7c67
diff --git a/src/backends/reference/workloads/RefElementwiseWorkload.cpp b/src/backends/reference/workloads/RefElementwiseWorkload.cpp
index 60a1b99..a18c7c5 100644
--- a/src/backends/reference/workloads/RefElementwiseWorkload.cpp
+++ b/src/backends/reference/workloads/RefElementwiseWorkload.cpp
@@ -70,3 +70,6 @@
 
 template class armnn::BaseFloat32ElementwiseWorkload<armnn::MaximumQueueDescriptor, armnn::maximum<float>>;
 template class armnn::BaseUint8ElementwiseWorkload<armnn::MaximumQueueDescriptor, armnn::maximum<float>>;
+
+template class armnn::BaseFloat32ElementwiseWorkload<armnn::MinimumQueueDescriptor, armnn::minimum<float>>;
+template class armnn::BaseUint8ElementwiseWorkload<armnn::MinimumQueueDescriptor, armnn::minimum<float>>;