Remove all traces of OpenCL

Change-Id: I4e00edd2d1572c3e2c1fcb56824239c166253cbc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/412958
Reviewed-by: Eric Boren <borenet@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
78 files changed