COMPMID-948: Remove unused code in CLReductionOperationKernel

Remove redudant code left over from validation method refactoring.
Update output shapes in CL/ReductionOperation Validate test suite.

Change-Id: Ica846dd7f65380fa21708472e10b5bc609a32027
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/131207
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Pablo Tello <pablo.tello@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
2 files changed