qemu: Remove remnants of xenner support

Both of these are dead code: qemu_command.c explicitly rejects
VIRT_XEN earlier in the call chain, and qemu_parse_command.c
will never set VIRT_XEN anymore
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>
Signed-off-by: NCole Robinson <crobinso@redhat.com>

src/qemu/qemu_command.c

@@ -7086,10 +7086,6 @@ qemuBuildObsoleteAccelArg(virCommandPtr cmd,
         }
         break;
 
-    case VIR_DOMAIN_VIRT_XEN:
-        /* XXX better check for xenner */
-        break;
-
     default:
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("the QEMU binary does not support %s"),

src/qemu/qemu_parse_command.c

@@ -2607,10 +2607,7 @@ qemuParseCommandLine(virCapsPtr caps,
         virDomainVideoDefPtr vid;
         if (VIR_ALLOC(vid) < 0)
             goto error;
-        if (def->virtType == VIR_DOMAIN_VIRT_XEN)
-            vid->type = VIR_DOMAIN_VIDEO_TYPE_XEN;
-        else
-            vid->type = video;
+        vid->type = video;
         if (vid->type == VIR_DOMAIN_VIDEO_TYPE_QXL) {
             vid->vgamem = QEMU_QXL_VGAMEM_DEFAULT;
         } else {