MAINTAINERS: Add Namjae's exfat git tree

Add Namjae's exfat git tree.
Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

MAINTAINERS

@@ -7573,6 +7573,7 @@ M:	Namjae Jeon <linkinjeon@kernel.org>
 M:	Sungjong Seo <sj1557.seo@samsung.com>
 L:	linux-fsdevel@vger.kernel.org
 S:	Maintained
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat.git
 F:	fs/exfat/
 
 EXT2 FILE SYSTEM