Supporting more IRQs than NR_IRQS + 8196 on ARM64 server

[Yang Yingliang]

Hi, Marc
    Current system only supports (NR_IRQS + 8196) interrupts.  It's not 
enough on ARM64
server, on D06 we have several pcie devices and each device supports 256 
VMs and each
VM uses 64 interrupts. Can we set NR_IRQS to a bigger value to support 
more interrupts ?

Thanks,
Yang