OpenCL: Update CLtypes.h to cl_types.h This change/enhancement is to keep codebase more consistent since vulkan backend versions of this header use lowercase-snake_case for file name. Bug: angleproject:8501 Change-Id: I223712c72db06425d192ddfe7300e5475c341e38 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5233364 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>