[PATCH 0/12] RISC-V: Clean up the defconfigs

[Palmer Dabbelt]

It's been a while since updating the defconfigs, so I figured it would
be good to go through all the diff to make sure nothing was lurking.  It
turns out there were two minor issues, which I've fixed with the first
two patches.  The rest of these are just cleanups that should have no
functional change.

I don't have a K210 (I might somewhere, but I've yet to boot it) so I
can't test this to make sure, but I think patch 2 is the reason we have
a special !MMU PAGE_OFFSET config.  If someone does have one it'd be
nice to be able to remove that special case.