MAINTAINERS: Update Akihiko Odaki's affiliation

MAINTAINERS: Update Akihiko Odaki's affiliation

My contract with Daynix Computing Ltd. will expire by the end of May,
2025. As I may contribute to QEMU for my research, use my email address
at the lab.

As I'm the only maintainer of igb and no longer financially supported to
maintain it, change its status to Odd Fixes until someone steps up.

Signed-off-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20250531-rsg-v1-1-e0bae1e1d90e@rsg.ci.i.u-tokyo.ac.jp>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>