Remove Ci20 MIPS devices

Bug: skia:
NOTRY=true
Change-Id: I125154a1e217fcaf085bdac704e3e761bf1e61d2
Reviewed-on: https://skia-review.googlesource.com/26380
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
2 files changed