IB/hfi1: Remove INTx support and simplify MSIx usage

The INTx IRQ support does not work for all HF1 IRQ handlers
(specifically the receive data IRQs).

Remove all supporting code for the INTx IRQ.

If the requested MSIx vector request is unsuccessful, do not allow the
driver to continue.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Kamenee Arumugam <kamenee.arumugam@intel.com>
Reviewed-by: Sadanand Warrier <sadanand.warrier@intel.com>
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>