Add CHANNEL_RUBIK as enum, add channels to pushimage request

BUG=b:202716782,b:215089089
TEST=./generate.sh

Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/3216174
Commit-Queue: Jack Neus <jackneus@google.com>
Auto-Submit: Jack Neus <jackneus@google.com>
Reviewed-by: George Engelbrecht <engeg@google.com>
(cherry picked from commit 47f0a4f1e46dbf43f89208f9678c4407d987638e)
Change-Id: Id556ce3c1c447a7ee6068e93c65e2c32d780c6fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/3399601
Reviewed-by: Conor McNamara <ctmcnamara@chromium.org>
Commit-Queue: Conor McNamara <ctmcnamara@chromium.org>
Commit-Queue: George Engelbrecht <engeg@google.com>
5 files changed