Bug 1656731 - Add Intel(R) UHD Graphics 617 to the KabyLake GT2 list r=mstange

added according to Jeff's gpudb
a65476109a/intel.json (L308)

Differential Revision: https://phabricator.services.mozilla.com/D86381

widget/GfxDriverInfo.cpp

@@ -623,6 +623,7 @@ const GfxDeviceFamily* GfxDriverInfo::GetDeviceFamily(DeviceFamily id) {
       APPEND_DEVICE(0x5923);
       APPEND_DEVICE(0x5927);
       APPEND_DEVICE(0x593b);
+      APPEND_DEVICE(0x87c0);
 
       // coffeelake gt1
       APPEND_DEVICE(0x3e90);