IVGCVSW-2043 - Merger using ACL for innermost concat axis
     * Add ClMergerWorkload and NeonMergerWorkload to call ACL for innermost concat axis
     * Modify layer support to call ClMergerWorkloadValidate and NeonMergerWorkloadValidate when concat axis is inner most
     * Add m_ConcatAxis to MergerDescriptor
     * Modify MergerQueueDescriptor::Validate to check sub tensor only when using subtensor

!android-nn-driver:166

Change-Id: I56676b43964c8d6d726387b41b3cc34a512c0f0a
diff --git a/src/backends/cl/backend.mk b/src/backends/cl/backend.mk
index fd7ea80..551e1a0 100644
--- a/src/backends/cl/backend.mk
+++ b/src/backends/cl/backend.mk
@@ -28,6 +28,7 @@
         workloads/ClL2NormalizationFloatWorkload.cpp \
         workloads/ClLstmFloatWorkload.cpp \
         workloads/ClMeanWorkload.cpp \
+        workloads/ClMergerWorkload.cpp \
         workloads/ClMultiplicationWorkload.cpp \
         workloads/ClNormalizationFloatWorkload.cpp \
         workloads/ClPadWorkload.cpp \