ibmvnic: change maintainers for vnic driver

Changed maintainers for vnic driver, since Dany has new responsibilities.
Also added Nick Child as reviewer.

Signed-off-by: Rick Lindsley <ricklind@us.ibm.com>
Link: https://lore.kernel.org/r/20221028203509.4070154-1-ricklind@us.ibm.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>