Get PCIe link speed (on Win server 2012) - wmic command

Because lspci can't run on win server 2012, so I tried to find another solution. And finally I find solution from microsoft.

wmic /namespace:\\root\StandardCimv2 path MSFT_NetAdapterHardwareInfoSettingData get Caption, PciExpressCurrentLinkSpeedEncoded /format:list

Reference: https://msdn.microsoft.com/en-us/library/hh872354(v=vs.85).aspx