Patch Set 3:
Why is this needed?

Due to recommendation(captured in EDS and BIOS Spec), no LPSS controllers can share same IRQs. However the rest of the PCI devices can share the IRQs from 16-23. That is why is controller is a LPSS controllers, will have to re-assign a different IRQ that the other controllers. So this function was needed to know if controller is a LPSS controller and assign a unique IRQ.

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