I've built interests in dirty limit and dirty page rate
features and also have been working on projects related
to this subsystem.

Add a section to the MAINTAINERS file for migration
dirty limit and dirty page rate.

Add myself as a maintainer for this subsystem so that I
can help to improve the dirty limit algorithm and review
the patches about dirty page rate.

Signed-off-by: Hyman Huang(黄勇) <yong.huang@smartx.com>
Acked-by: Peter Xu <peterx@redhat.com>
Message-ID: <169073570563.19893.2928364761104733482-3@git.sr.ht>
Acked-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>