Bump RC, firesim and barstools for chisel3.4 updates
Note: firesim and barstools point to commits in the sifive forks of those repos I didn't update the URL in .gitmodules because I'm not sure how that works in a PR (because you wouldn't really want to merge sync'ing to the sifive repo). Requires: ucb-bar/barstools#92 and firesim/firesim#658 The version of rocket-chip, chisel3 and firrtl is chosen here because it is the latest known to pass my tests. You will likely want to bump further.
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