RISC-V: Add Jim Wilson as a maintainer

Jim has recently started working at SiFive, where he'll be contributing
to our GCC port.  Andrew, Kito and I would like him to be a mainatiner.
My understand is that this is the 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.

ChangeLog

2017-11-15  Palmer Dabbelt  <palmer@sifive.com>

        * MAINTAINERS (RISC-V): Add Jim Wilson as a maintainer.
        Use my SiFive email address.

From-SVN: r254774

ChangeLog

+2017-11-06  Palmer Dabbelt  <palmer@sifive.com>
+
+	* MAINTAINERS (RISC-V): Add Jim Wilson as a maintainer.
+	Use my SiFive email address.
+
 2017-11-15  Sebastian Peryt  <sebastian.peryt@intel.com>
 
 	* MAINTAINERS (write after approval): Add myself.

MAINTAINERS

@@ -93,8 +93,9 @@ pdp11 port		Paul Koning		<ni1d@arrl.net>
 picochip port		Daniel Towner		<dant@picochip.com>
 powerpcspe port		Andrew Jenner		<andrew@codesourcery.com>
 riscv port		Kito Cheng		<kito.cheng@gmail.com>
-riscv port		Palmer Dabbelt		<palmer@dabbelt.com>
+riscv port		Palmer Dabbelt		<palmer@sifive.com>
 riscv port		Andrew Waterman		<andrew@sifive.com>
+riscv port		Jim Wilson		<jimw@sifive.com>
 rl78 port		DJ Delorie		<dj@redhat.com>
 rs6000/powerpc port	David Edelsohn		<dje.gcc@gmail.com>
 rs6000/powerpc port	Segher Boessenkool	<segher@kernel.crashing.org>