In testing RTEMS on the ZynqMP platform, I noticed that priority queues
were not functioning properly. I tracked this down to an unconnected
interrupt source in the Cadence GEM when multiple priority queues are
configured. I'm not sure if the Cadence IP can actually be configured
for separate interrupt sources per queue, so I opted to leave the
multiple IRQ sources intact and connect the additional sources on
platforms that need it. If it makes more sense to route all interrutps
for this peripheral through a single interrupt source, I can submit that
patch instead.