crosvm_control: Add make_rt API
crosvm_control: Add make_rt API

Adds a make_rt API to the crosvm_control library.

BUG=b:188858559
TEST=cq

Change-Id: I3affcd6cb003a17f125b45e78906fabe1e371c43
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3635255
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Commit-Queue: Kameron Lutes <d812b9f24eeb5acef9cc7e601b6b603be1696a90@chromium.org>
Reviewed-by: Junichi Uekawa <6bd240a6ce32463e272bb69c685a8e946b33ac05@chromium.org>

google/crosvm,google/crosvm,google/crosvm,google/crosvm