MAINTAINERS: kgdb: Add myself as a reviewer for kgdb/kdb

I'm interested in kdb / kgdb and have sent various fixes over the
years.  I'd like to get CCed on patches so I can be aware of them and
also help review.

Signed-off-by: Douglas Anderson <[email protected]>
Acked-by: Daniel Thompson <[email protected]>
Link: https://lore.kernel.org/r/20190920104404.1.I237e68e8825e2d6ac26f8e847f521fe2fcc3705a@changeid
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: dianders

MAINTAINERS

@@ -9075,6 +9075,7 @@ F:	security/keys/
 KGDB / KDB /debug_core
 M:	Jason Wessel <[email protected]>
 M:	Daniel Thompson <[email protected]>
+R:	Douglas Anderson <[email protected]>
 W:	http://kgdb.wiki.kernel.org/
 L:	[email protected]
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/kgdb.git