COMPMID-864 Window::collapse_if_possible() is misused in several CL kernels

Removed unnecessary collapse_if_possible() calls.

Change-Id: I6f3434bc4a26470c4de5bac4e3d90b4b019c2c9c
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/117993
Reviewed-by: Michalis Spyrou <michalis.spyrou@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
diff --git a/src/core/NEON/kernels/NEReshapeLayerKernel.cpp b/src/core/NEON/kernels/NEReshapeLayerKernel.cpp
index a0f324e..45ba68d 100644
--- a/src/core/NEON/kernels/NEReshapeLayerKernel.cpp
+++ b/src/core/NEON/kernels/NEReshapeLayerKernel.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 ARM Limited.
+ * Copyright (c) 2017-2018 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -46,7 +46,6 @@
     const TensorShape &output_shape = output->info()->tensor_shape();
     Coordinates        output_coord{};
 
-    window.collapse_if_possible(window, 3);
     Iterator in(input, window);
 
     execute_window_loop(window, [&](const Coordinates & id)