MAINTAINERS: ibmvnic: drop Dany from reviewers

I missed that Dany uses a different email address
when tagging patches (drt@linux.ibm.com)
and asked him if he's still actively working on ibmvnic.
He doesn't really fall under our removal criteria,
but he admitted that he already moved on to other projects.

Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240109164517.3063131-8-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

MAINTAINERS

@@ -10155,7 +10155,6 @@ IBM Power SRIOV Virtual NIC Device Driver
 M:	Haren Myneni <haren@linux.ibm.com>
 M:	Rick Lindsley <ricklind@linux.ibm.com>
 R:	Nick Child <nnac123@linux.ibm.com>
-R:	Dany Madden <danymadden@us.ibm.com>
 R:	Thomas Falcon <tlfalcon@linux.ibm.com>
 L:	netdev@vger.kernel.org
 S:	Supported