COMPMID-3957: Deprecate neon CV functions.

Change-Id: Idfc215c4f95472e2e61d2972cfd5d33786cc088e
Signed-off-by: morgolock <pablo.tello@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/4341
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Reviewed-by: Sheri Zhang <sheri.zhang@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/runtime/NEON/functions/NEChannelExtract.h b/arm_compute/runtime/NEON/functions/NEChannelExtract.h
index 4b6383d..99522d2 100644
--- a/arm_compute/runtime/NEON/functions/NEChannelExtract.h
+++ b/arm_compute/runtime/NEON/functions/NEChannelExtract.h
@@ -33,7 +33,11 @@
 class ITensor;
 using IImage = ITensor;
 
-/**Basic function to run @ref NEChannelExtractKernel to perform channel extraction. */
+/**Basic function to run @ref NEChannelExtractKernel to perform channel extraction.
+ *
+ * @deprecated This function is deprecated and is intended to be removed in 21.05 release
+ *
+*/
 class NEChannelExtract : public INESimpleFunctionNoBorder
 {
 public: