IVGCVSW-3341 Add Neon backend support for Quantized_LSTM (16bit cell state)

 * Add Neon Workload
 * Update NeonWorkloads.hpp
 * Update NeonWorkloadFactory
 * Update NeonLayerSupport
 * Update backends.mk and CMakeLists.txt
 * Add NeonCreateWorkload test
 * Enable LayerTest

!android-nn-driver:1685

Change-Id: Idd799bbf039acf0d59084d02c3b57766ce3691b5
Signed-off-by: Francis Murtagh <francis.murtagh@arm.com>
Signed-off-by: Matthew Bentham <Matthew.Bentham@arm.com>
diff --git a/src/backends/neon/workloads/NeonWorkloads.hpp b/src/backends/neon/workloads/NeonWorkloads.hpp
index 7cb6c3b..8fc684e 100644
--- a/src/backends/neon/workloads/NeonWorkloads.hpp
+++ b/src/backends/neon/workloads/NeonWorkloads.hpp
@@ -18,6 +18,7 @@
 #include "NeonGreaterWorkload.hpp"
 #include "NeonL2NormalizationFloatWorkload.hpp"
 #include "NeonLstmFloatWorkload.hpp"
+#include "NeonQuantizedLstmWorkload.hpp"
 #include "NeonMaximumWorkload.hpp"
 #include "NeonMeanWorkload.hpp"
 #include "NeonConcatWorkload.hpp"