RISC-V Patches for the 5.2 Merge Window, Part 1

This patch set contains an assortment of RISC-V related patches that I'd
like to target for the 5.2 merge window.  Most of the patches are
cleanups, but there are a handful of user-visible changes:

* The nosmp and nr_cpus command-line arguments are now supported, which
  work like normal.
* The SBI console no longer installs itself as a preferred console, we
  rely on standard mechanisms (/chosen, command-line, hueristics)
  instead.
* sfence_remove_sfence_vma{,_asid} now pass their arguments along to the
  SBI call.
* Modules now support BUG().
* A missing sfence.vma during boot has been added.  This bug only
  manifests during boot.

I've only tested this on QEMU again, as I didn't have time to get things
running on the Unleashed.  The latest master from this morning merges in
cleanly and passes the tests as well.
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