dwc_eqos - segmentation offload and vlan fixes

[idigdoug]

• Add a README.md.
• Add a REG file for enabling a diagnostic ETW autologger.
• Implement TCP segmentation offload (LSOv2).
• Implement UDP fragmentation offload (USO).
• Instead of making a half-baked effort to adapt to disabled hardware features (i.e. lack of Checksum or Segment offload support), check for the feature and don't load if it's missing. At present, I have nothing to test this on and it just makes the code messy. We can add adaptability back in the future if anybody actually wants it and has hardware to test it.
• Fix problems with error logging in Tx path (error bit is only valid for LastDescriptor).
• Fix problems with VLAN tag insertion.
• Fix problems with checksum offload configuration. NetAdapterCx only recognizes the "granular" options.