powerpc/powernv: Implement MSI support for p5ioc2 PCIe
This implements support for MSIs on p5ioc2 PHBs. We only support
MSIs on the PCIe PHBs, not the PCI-X ones as the later hasn't been
properly verified in HW.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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