IVGCVSW-7308 Add GpuAcc Batch MatMul workload

* Call dedicated MatMul kernel in ACL
* Add int8 tests
* Add int8 to documentation
* Force tensors to be dynamic (nonConst) as per request of ACL

Signed-off-by: Teresa Charlin <teresa.charlinreyes@arm.com>
Change-Id: I7b7ac20deec8637dc46ca990d339d92c4587cbe4
diff --git a/src/backends/cl/ClLayerSupport.cpp b/src/backends/cl/ClLayerSupport.cpp
index b638375..6fa4f3c 100644
--- a/src/backends/cl/ClLayerSupport.cpp
+++ b/src/backends/cl/ClLayerSupport.cpp
@@ -720,7 +720,8 @@
                                    inputX,
                                    inputY,
                                    output,
-                                   descriptor);
+                                   descriptor,
+                                   nullptr);
 }
 
 bool ClLayerSupport::IsBatchNormalizationSupported(const TensorInfo& input,