MAINTAINERS: create an entry for exportfs

Split the exportfs entry from the nfsd entry and add myself as reviewer.
Suggested-by: Chuck Lever <chuck.lever@oracle.com>
Acked-by: Chuck Lever <chuck.lever@oracle.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Link: https://lore.kernel.org/r/20231026205553.143556-1-amir73il@gmail.comSigned-off-by: Christian Brauner <brauner@kernel.org>

MAINTAINERS

@@ -8051,6 +8051,18 @@ F:	include/linux/fs_types.h
 F:	include/uapi/linux/fs.h
 F:	include/uapi/linux/openat2.h
 
+FILESYSTEMS [EXPORTFS]
+M:	Chuck Lever <chuck.lever@oracle.com>
+M:	Jeff Layton <jlayton@kernel.org>
+R:	Amir Goldstein <amir73il@gmail.com>
+L:	linux-fsdevel@vger.kernel.org
+L:	linux-nfs@vger.kernel.org
+S:	Supported
+F:	Documentation/filesystems/nfs/exporting.rst
+F:	fs/exportfs/
+F:	fs/fhandle.c
+F:	include/linux/exportfs.h
+
 FINTEK F75375S HARDWARE MONITOR AND FAN CONTROLLER DRIVER
 M:	Riku Voipio <riku.voipio@iki.fi>
 L:	linux-hwmon@vger.kernel.org
@@ -11420,7 +11432,6 @@ S:	Supported
 W:	http://nfs.sourceforge.net/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux.git
 F:	Documentation/filesystems/nfs/
-F:	fs/exportfs/
 F:	fs/lockd/
 F:	fs/nfs_common/
 F:	fs/nfsd/