COMPMID-765: Collapse execution window in CL kernels.

Updated following kernels to collapse their execution window and reduce
number of kernel enqueues:
-CLArithmeticAddition
-CLArithmeticSubtraction
-CLPixelWiseMultiplication

Change-Id: I13d503515a20fa9be1401ead1e27e9bbc6627975
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/114878
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Tested-by: Anthony Barbier <anthony.barbier@arm.com>
4 files changed