IVGCVSW-3723 Adding reference workload support for ArgMinMax

Change-Id: I65209ecec4e3abf808163239748d6e830568c2e3
Signed-off-by: Nikhil Raj <nikhil.raj@arm.com>
diff --git a/src/backends/reference/backend.mk b/src/backends/reference/backend.mk
index b2ec748..fd0df27 100644
--- a/src/backends/reference/backend.mk
+++ b/src/backends/reference/backend.mk
@@ -23,6 +23,7 @@
         RefTensorHandleFactory.cpp \
         workloads/Abs.cpp \
         workloads/Activation.cpp \
+        workloads/ArgMinMax.cpp \
         workloads/BatchNormImpl.cpp \
         workloads/BatchToSpaceNd.cpp \
         workloads/Broadcast.cpp \
@@ -40,6 +41,7 @@
         workloads/PreluImpl.cpp \
         workloads/RefAbsWorkload.cpp \
         workloads/RefActivationWorkload.cpp \
+        workloads/RefArgMinMaxWorkload.cpp \
         workloads/RefBatchNormalizationWorkload.cpp \
         workloads/RefBatchToSpaceNdWorkload.cpp \
         workloads/RefConcatWorkload.cpp \