COMPMID-571: Implement reference and CL/NEON validation for Erode

Change-Id: I7cc6acc4947f77412230e286ab9b14304f35b025
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/90869
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Reviewed-by: Pablo Tello <pablo.tello@arm.com>
diff --git a/arm_compute/runtime/CL/functions/CLErode.h b/arm_compute/runtime/CL/functions/CLErode.h
index cd2f551..a929cc9 100644
--- a/arm_compute/runtime/CL/functions/CLErode.h
+++ b/arm_compute/runtime/CL/functions/CLErode.h
@@ -49,7 +49,7 @@
      * @param[in]     border_mode           Border mode to use for the convolution.
      * @param[in]     constant_border_value (Optional) Constant value to use for borders if border_mode is set to CONSTANT.
      */
-    void configure(ICLTensor *input, ICLTensor *output, BorderMode border_mode, uint8_t constant_border_value);
+    void configure(ICLTensor *input, ICLTensor *output, BorderMode border_mode, uint8_t constant_border_value = 0);
 };
 }
 #endif /*__ARM_COMPUTE_CLERODE_H__ */