ibmvnic: update MAINTAINERS

Tom wrote most of the driver code and his experience is valuable to us.
Add him as a Reviewer so that patches will be Cc'ed and reviewed by him.
Signed-off-by: NLijun Pan <ljp@linux.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

MAINTAINERS

@@ -8521,6 +8521,7 @@ IBM Power SRIOV Virtual NIC Device Driver
 M:	Dany Madden <drt@linux.ibm.com>
 M:	Lijun Pan <ljp@linux.ibm.com>
 M:	Sukadev Bhattiprolu <sukadev@linux.ibm.com>
+R:	Thomas Falcon <tlfalcon@linux.ibm.com>
 L:	netdev@vger.kernel.org
 S:	Supported
 F:	drivers/net/ethernet/ibm/ibmvnic.*