update barstools: move iocells to separate project root
Currently Chipyard is including `barstools.iocell` as a separate project from the rest of barstools, and it does this by creating a new project rooted at `src` with its source directory rooted at `src/main/scala/barstools/iocell`. This causes problems for IDEs like IntelliJ which do not support having one source root from one project nested inside another source root from a different project. By breaking out `barstools.iocell` into a separate project root, this should cause IDEs and similar tools to better understand the project structure, and makes it so that `iocell` is not in two projects at the same time.
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