nfp: remove Rolf Neugebauer as co-maintainer

Rolf is no longer in his previous role at Netronome and as far as I know no
longer working on the NFP driver. Thus it does not seem appropriate for him
to be a co-maintainer anymore.
Reviewed-by: Dinan Gunawardena <dinan.gunawardena@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

MAINTAINERS

@@ -7501,7 +7501,6 @@ F:	net/netrom/
 
 NETRONOME ETHERNET DRIVERS
 M:	Jakub Kicinski <jakub.kicinski@netronome.com>
-M:	Rolf Neugebauer <rolf.neugebauer@netronome.com>
 L:	oss-drivers@netronome.com
 S:	Maintained
 F:	drivers/net/ethernet/netronome/