Opt out of scripts/get_maintainer.pl

A few months ago, I submitted a trivial arm64 defconfig update.
get_maintainer.pl now outputs my address for every defconfig tweak.
Add me to .get_maintainer.ignore to opt out of these notifications.
Signed-off-by: Marc Gonzalez <marc.w.gonzalez@free.fr>
Signed-off-by: Olof Johansson <olof@lixom.net>

.get_maintainer.ignore

 Christoph Hellwig <hch@lst.de>
+Marc Gonzalez <marc.w.gonzalez@free.fr>