COMPMID-2649: Generalize MemoryGroup.

Avoids any upcasting.

Change-Id: I2181c7c9df59a7fb8a78e11934fbd96058fd39c7
Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Reviewed-on: https://review.mlplatform.org/c/1918
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Gian Marco Iodice <gianmarco.iodice@arm.com>
diff --git a/arm_compute/runtime/CL/functions/CLRNNLayer.h b/arm_compute/runtime/CL/functions/CLRNNLayer.h
index fc86992..47b8cd4 100644
--- a/arm_compute/runtime/CL/functions/CLRNNLayer.h
+++ b/arm_compute/runtime/CL/functions/CLRNNLayer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018 ARM Limited.
+ * Copyright (c) 2018-2019 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -72,7 +72,7 @@
     void prepare() override;
 
 private:
-    CLMemoryGroup                        _memory_group;
+    MemoryGroup                          _memory_group;
     CLGEMM                               _gemm_state_f;
     CLSaturatedArithmeticOperationKernel _add_kernel;
     CLActivationLayerKernel              _activation_kernel;