[skolo] Remove missing rpi1s.
[skolo] Remove missing rpi1s.

They aren't on any rack.
Change-Id: I665ca220f3b221da95998032f5123b02ed6adc65
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/477988
Reviewed-by: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Commit-Queue: Erik Rose <042ad22d8352d59a3d816dac710aebe65456f16e@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot