hw/rdma: Add ability to force notification without re-arm

hw/rdma: Add ability to force notification without re-arm

Upon completion of incoming packet the device pushes CQE to driver's RX
ring and notify the driver (msix).
While for data-path incoming packets the driver needs the ability to
control whether it wished to receive interrupts or not, for control-path
packets such as incoming MAD the driver needs to be notified anyway, it
even do not need to re-arm the notification bit.

Enhance the notification field to support this.

Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
Reviewed-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>