rdma: Update maintainer contact for Intel RDMA drivers

Ensure both Mike and I are listed as maintainer contacts for Intel's qib,
hfi1, and rdmavt drivers.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>