MAINTAINERS: .mailmap: Update Hans de Goede's email address

I'm moving all my kernel work over to using my kernel.org email address.
Update .mailmap and MAINTAINER entries still using hdegoede@redhat.com.

Signed-off-by: Hans de Goede <hansg@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>