IVGCVSW-3236 Extend Ref LSTM with layer normalization support

* Add descriptor values
* Update lstm queue descriptor validate function
* Update lstm workload
* Update isLstmSupported (Cl and Ref), LayerSupportBase, ILayerSupport
* Update lstm layer
* Add unit tests

Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: I932175d550facfb342325051eaa7bd2084ebdc18
Signed-off-by: Jan Eilers <jan.eilers@arm.com>
diff --git a/src/backends/reference/workloads/CMakeLists.txt b/src/backends/reference/workloads/CMakeLists.txt
index 3c0af01..696605d 100644
--- a/src/backends/reference/workloads/CMakeLists.txt
+++ b/src/backends/reference/workloads/CMakeLists.txt
@@ -28,6 +28,7 @@
     Gather.cpp
     Gather.hpp
     LstmUtils.hpp
+    LstmUtils.cpp
     Maximum.hpp
     Mean.cpp
     Mean.hpp