Merge #218

218: Adjust the setup-qemu and test-qemu-hifive make actions to work with the new tock version. r=jrvanwhy a=jrvanwhy

PR #207 updated the `tock` submodule. The new submodule version includes the following PR: https://github.com/tock/tock/pull/1880, which changed the `tock` Makefile actions related to QEMU setup. This updates `make setup-qemu` to work with the new Tock makefile.

Tock no longer checks if QEMU was already setup when running setup actions, so I removed `test-qemu-hifive`'s dependency on `qemu-setup`. `make setup` still depends on `qemu-setup`.

Co-authored-by: Johnathan Van Why <jrvanwhy@google.com>