MAINTAINERS: Use Daniel Thompson's korg address for kgdb work

Going forward, I'll be using my kernel.org address for upstream work.

Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20241108-new-maintainer-address-2-v1-2-47c9d71aac11@linaro.org


Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>