RISC-V: Add Jim Wilson as a maintainer, and clean up our entries

Jim has recently started working at SiFive, where he'll be contributing
to our binutils port.  Andrew and I would like him to be a maintainer.
My understanding is that this is right place to ask.

I've also changed my address to my SiFive one, where I also work -- it
seems cleaner to have everyone use our proper email address.  While I
was in there, I noticed a trailing space after Andrew's name so I went
ahead and removed it as well.

binutils/ChangeLog

2017-11-07  Palmer Dabbelt  <palmer@sifive.com>

        * MAINTAINERS (RISC-V): Add Jim Wilson as a maintainer.
        Clean up Andrew's entry (remove trailing space, add tabs).
        Change Palmer's email address, and clean up entry (add tabs).

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