MAINTAINERS: add myself as a dedicated reviewer of f2fs

I volunteer to be a dedicated reviewer of f2fs, add my email address in
maintainship entry of f2fs.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index cbf6113..bb5e3a9 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4406,6 +4406,7 @@
 F2FS FILE SYSTEM
 M:	Jaegeuk Kim <jaegeuk@kernel.org>
 M:	Changman Lee <cm224.lee@samsung.com>
+R:	Chao Yu <chao2.yu@samsung.com>
 L:	linux-f2fs-devel@lists.sourceforge.net
 W:	http://en.wikipedia.org/wiki/F2FS
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git