Bug 1676936 - Enable WebRender on Kaveri in nightly/early beta. r=aosmond

Differential Revision: https://phabricator.services.mozilla.com/D96886

widget/GfxDriverInfo.cpp

@@ -763,6 +763,9 @@ const GfxDeviceFamily* GfxDriverInfo::GetDeviceFamily(DeviceFamily id) {
       APPEND_RANGE(0x9870, 0x9877);
 
 #ifdef EARLY_BETA_OR_EARLIER
+      // Kaveri
+      APPEND_RANGE(0x1304, 0x131d);
+
       // R700
       APPEND_RANGE(0x9440, 0x949f);
       APPEND_RANGE(0x94a0, 0x94b9);