Fix setup of compatability serial devices from console device

The <console> tag is supposed to result in addition of a single
<serial> device for HVM guests. The 'targetType' attribute was
missing though causing the compatibility code to add a second
<console> device

* src/conf/domain_conf.c: Set targetType for serial device

src/conf/domain_conf.c

@@ -3748,6 +3748,7 @@ static virDomainDefPtr virDomainDefParseXML(virConnectPtr conn,
                 }
                 def->nserials = 1;
                 def->serials[0] = chr;
+                chr->targetType = VIR_DOMAIN_CHR_TARGET_TYPE_SERIAL;
             }
         } else {
             def->console = chr;