IVGCVSW-4449 Add QLstm ref implementation

* Adds ref implemenation for new HAL 1.3
  operator, QLstm.
* Adds Layer and CreateWorkload unit tests.
* Adds WorkloadData validate for QLstm.

Signed-off-by: James Conroy <james.conroy@arm.com>
Change-Id: I8a721f07ff06105e6495a1a0561b9503aa8146dc
diff --git a/src/backends/reference/workloads/RefWorkloads.hpp b/src/backends/reference/workloads/RefWorkloads.hpp
index cbfade3..e396a6b 100644
--- a/src/backends/reference/workloads/RefWorkloads.hpp
+++ b/src/backends/reference/workloads/RefWorkloads.hpp
@@ -48,6 +48,7 @@
 #include "RefPermuteWorkload.hpp"
 #include "RefPadWorkload.hpp"
 #include "RefPreluWorkload.hpp"
+#include "RefQLstmWorkload.hpp"
 #include "RefQuantizeWorkload.hpp"
 #include "RefReshapeWorkload.hpp"
 #include "RefResizeBilinearWorkload.hpp"