MAINTAINERS: exclude net/ceph from networking

net/ceph (libceph) patches have always gone through the Ceph tree.
Avoid CCing netdev in addition to ceph-devel list.

Signed-off-by: Ilya Dryomov <[email protected]>
Acked-by: Jakub Kicinski <[email protected]>

Author: idryomov

MAINTAINERS

@@ -16157,6 +16157,7 @@ X:	include/net/mac80211.h
 X:	include/net/wext.h
 X:	net/9p/
 X:	net/bluetooth/
+X:	net/ceph/
 X:	net/mac80211/
 X:	net/rfkill/
 X:	net/wireless/