COMPMID-1478: Updated OpenCL headers to the latest Khronos ones

Change-Id: Ie26b78c9da635206c96111ea490ac565063838ba
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/143408
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Pablo Tello <pablo.tello@arm.com>
8 files changed