MAINTAINERS: Update usnic driver maintainers

Add Nelson Escobar and myself as maintainers for
drivers/infiniband/hw/usnic
Signed-off-by: Parvi Kaustubhi <pkaustub@cisco.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

MAINTAINERS

@@ -3662,6 +3662,8 @@ F:	drivers/net/ethernet/cisco/enic/
 
 CISCO VIC LOW LATENCY NIC DRIVER
 M:	Christian Benvenuti <benve@cisco.com>
+M:	Nelson Escobar <neescoba@cisco.com>
+M:	Parvi Kaustubhi <pkaustub@cisco.com>
 S:	Supported
 F:	drivers/infiniband/hw/usnic/