MAINTAINERS: qemu-trivial information

MAINTAINERS: qemu-trivial information

Information about "qemu-trivial" ML can be found in the wiki:

    http://wiki.qemu.org/Contribute/TrivialPatches

But the first place where a developer looks is the file MAINTAINERS.

This also allows the get_maintainer.pl script to display
the qemu-trivial ML address when the mail subject contains "trivial".

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>