AMD IOMMUv2 performance counter patch and family 15h model 10h-1Fhquirk

From: Steven Kinney
Date: Fri Nov 16 2012 - 17:43:36 EST

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These patches add AMD IOMMUv2 perfomance counter support and allow external
drivers to manage the PC; for example, a implementation of perf IOMMUv2 PMU.

The quirk fixes a potential problem regarding BIOS and enables the IOMMUv2
Extended Feature Register PC bit targeting AMD Family 15h Model 10h-1Fh.

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