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/arm_compute/core/Window.inl b/arm_compute/core/Window.inl
index 23b2a8e..18d454a 100644
--- a/arm_compute/core/Window.inl
+++ b/arm_compute/core/Window.inl
@@ -77,6 +77,16 @@
     return collapsed;
 }
 
+inline Window Window::shift_dimensions(unsigned int shift_value) const
+{
+    Window shifted_window;
+    for(size_t n = 0; n < (Coordinates::num_max_dimensions - shift_value); n++)
+    {
+        shifted_window.set(n, _dims[n + shift_value]);
+    }
+    return shifted_window;
+}
+
 inline Window Window::collapse(const Window &full_window, const size_t first, const size_t last) const
 {
     bool   has_collapsed = false;