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>

MAINTAINERS

diff --git a/MAINTAINERS b/MAINTAINERS
index dd02d96..2287b18 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1078,3 +1078,8 @@
 M: Chrysostomos Nanakos <chris@include.gr>
 S: Maintained
 F: block/archipelago.c
+
+Bootdevice
+M: Gonglei <arei.gonglei@huawei.com>
+S: Maintained
+F: bootdevice.c