Bluetooth: Remove myself from the MAINTAINERS file

It's been sometime I'm not involved in Bluetooth anymore but I never
got around to remove my name from it. Doing it now.

Thanks for all the fish! :)

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>