Fix output address calculation in GEMM OpenCL kernels

Fix output address calculation in GEMM OpenCL kernels

Resolves COMPMID-3977

Change-Id: I222e0d1726993e54699646323820fc4ae53ab520
Signed-off-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/4530
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
(cherry picked from commit 5fa963fbbc00c716e120287051747b144e2d784c)
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/4171
Reviewed-by: Gian Marco Iodice <gianmarco.iodice@arm.com>
Tested-by: Gian Marco Iodice <gianmarco.iodice@arm.com>