Remove old devices.json and code

The code in cts subfolder was unused in over a year, and the SKQP stuff
was also unused (and non-inclusive).

Bug: 1097221
Change-Id: Icf3d37fbe773125ab714a9b68b1b620f39857b5c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/305438
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
Auto-Submit: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
53 files changed