[Patch] Display IOMMU pci subclass

[Dmitry Luhtionov]

pciconf output, found on Tyan S8236 motherboard

none0 at pci0:0:0:2:       class=0x080600 card=0x5a231002 chip=0x5a231002
rev=0x00 hdr=0x00
    vendor     = 'Advanced Micro Devices [AMD] nee ATI'
    device     = 'RD990 I/O Memory Management Unit (IOMMU)'
    class      = base peripheral

References:

http://www.pcisig.com/specifications/conventional/ECN_subclass_IB.pdf
http://www.pcisig.com/specifications/pciexpress/specifications/ECN-Change_Root_Complex_Event_Collector_Class_Code_2012-12-13.pdf
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