NFS: Add Anna Schumaker as co-maintainer for the NFS client

Anna has essentially been performing the duties of co-maintainer for
the past several years. In recognition of those efforts, I'd like to
add her to the maintainers file.

Cc: Anna Schumaker <anna.schumaker@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

MAINTAINERS

@@ -6682,6 +6682,7 @@ F:	Documentation/devicetree/bindings/net/nfc/
 
 NFS, SUNRPC, AND LOCKD CLIENTS
 M:	Trond Myklebust <trond.myklebust@primarydata.com>
+M:	Anna Schumaker <anna.schumaker@netapp.com>
 L:	linux-nfs@vger.kernel.org
 W:	http://client.linux-nfs.org
 T:	git git://git.linux-nfs.org/projects/trondmy/linux-nfs.git