Remove usage of valid window region in NHWC CPU kernels - Part2

Remove set_valid_region methods from all NHWC CPU ML functions /
operators / kernels

Resolves COMPMID-4152 (2/2)

Change-Id: If9725e9c5b0213b87db96675e81b7fb724970b98
Signed-off-by: SiCongLi <sicong.li@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5203
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/core/NEON/kernels/NEStridedSliceKernel.cpp b/src/core/NEON/kernels/NEStridedSliceKernel.cpp
index ac04a10..876368c 100644
--- a/src/core/NEON/kernels/NEStridedSliceKernel.cpp
+++ b/src/core/NEON/kernels/NEStridedSliceKernel.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2020 Arm Limited.
+ * Copyright (c) 2018-2021 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -84,7 +84,6 @@
 
     // Create window
     Window win = calculate_max_window(*output, Steps());
-    output->set_valid_region(ValidRegion(Coordinates(), output->tensor_shape()));
 
     return std::make_pair(Status{}, win);
 }