Try injecting both AAPL,ig-platform-id and AAPL00,DualLink properties
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>PciRoot(0x0)/Pci(0x2,0x0)</key>
<dict>
<key>AAPL,ig-platform-id</key>
<string>0x01660004</string>
<key>AAPL00,DualLink</key>
<string>0x00000001</string>
</dict>
</dict>
</plist>