RISC-V: We have a new mailing list and git repo!

Sorry to send something essentially as late as possible (Friday after an
rc9), but we managed to get a mailing list for the RISC-V Linux port.
We've been using patches@groups.riscv.org for a while, but that list has
some problems (it's Google Groups and it's shared over all RISC-V
software projects).  The new infaread.org list is much better.   We just
got it on Wednesday but I used it a bit on Thursday to shake out all the
configuration problems and it appears to be in working order.

When I updated the mailing list I noticed that the MAINTAINERS file was
pointing to our github repo, but now that we have a kernel.org repo I'd
like to point to that instead so I changed that as well.  We'll be
centralizing all RISC-V Linux related development here as that seems to
be the saner way to go about it.

I can understand if it's too late to get this into 4.15, but given that
it's not a code change I was hoping it'd still be OK.  It would be nice
to have the new mailing list and git repo in the release tarballs so
when people start to find bugs they'll get to the right place.
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