MAINTAINERS: add myself as bootdevice.c maintainer bootdevice.c was created by me, and I wrote most of the code in this file. And now I can maintain it, I'd hope nobody object this. Cc: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Gonglei <arei.gonglei@huawei.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>