MAINTAINERS: remove John Allen from ibmvnic

John's email has bounced and Thomas confirms he no longer
works on ibmvnic.

Signed-off-by: Jakub Kicinski <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: kuba-moo

MAINTAINERS

@@ -8322,7 +8322,6 @@ F:	drivers/pci/hotplug/rpaphp*
 
 IBM Power SRIOV Virtual NIC Device Driver
 M:	Thomas Falcon <[email protected]>
-M:	John Allen <[email protected]>
 L:	[email protected]
 S:	Supported
 F:	drivers/net/ethernet/ibm/ibmvnic.*