MAINTAINERS: Remove Dave Goodell from the usnic RDMA driver maintainer list

The e-mail address dgoodell@exch.cisco.com no longer exists. Additionally,
according to https://www.linkedin.com/in/goodell/ Dave is an Amazon
employee since December 2017. Hence remove his Cisco e-mail address from
the usnic maintainer list.
Signed-off-by: NBart Van Assche <bart.vanassche@wdc.com>
Acked-by: NChristian Benvenuti <benve@cisco.com>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>

MAINTAINERS

@@ -3506,7 +3506,6 @@ F:	drivers/net/ethernet/cisco/enic/
 
 CISCO VIC LOW LATENCY NIC DRIVER
 M:	Christian Benvenuti <benve@cisco.com>
-M:	Dave Goodell <dgoodell@cisco.com>
 S:	Supported
 F:	drivers/infiniband/hw/usnic/