RDMA/hw/hfi1/msix: Add description for 'name' and remove superfluous param 'idx'

RDMA/hw/hfi1/msix: Add description for 'name' and remove superfluous param 'idx'

Fixes the following W=1 kernel build warning(s):

 drivers/infiniband/hw/hfi1/msix.c:120: warning: Function parameter or member 'name' not described in 'msix_request_irq'
 drivers/infiniband/hw/hfi1/msix.c:120: warning: Excess function parameter 'idx' description in 'msix_request_irq'

Link: https://lore.kernel.org/r/20210126124732.3320971-6-lee.jones@linaro.org
Cc: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Cc: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-rdma@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>