cxgbe(4): Support SIOGIFXMEDIA so that ifconfig displays correct media

for 25Gbps and 100Gbps ports.   This should have been part of r305713,
which is when the driver first started reporting extended media types.

sys/dev/cxgbe/t4_main.c

@@ -1737,6 +1737,7 @@ fail:
 
 	case SIOCSIFMEDIA:
 	case SIOCGIFMEDIA:
+	case SIOCGIFXMEDIA:
 		ifmedia_ioctl(ifp, ifr, &vi->media, cmd);
 		break;
 

sys/dev/cxgbe/t4_tracer.c

@@ -472,6 +472,7 @@ tracer_ioctl(struct ifnet *ifp, unsigned long cmd, caddr_t data)
 		break;
 	case SIOCSIFMEDIA:
 	case SIOCGIFMEDIA:
+	case SIOCGIFXMEDIA:
 		sx_xlock(&t4_trace_lock);
 		sc = ifp->if_softc;
 		if (sc == NULL)