MAINTAINERS: add missing git address for ext2 entry

ext2 git address is missing, add it.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20240219063718.3682824-1-chao@kernel.org>

Author: chaseyu

MAINTAINERS

@@ -7984,6 +7984,7 @@ M:	Jan Kara <jack@suse.com>
 L:	linux-ext4@vger.kernel.org
 S:	Maintained
 F:	Documentation/filesystems/ext2.rst
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs.git
 F:	fs/ext2/
 F:	include/linux/ext2*