6820/6890: re-add box major and revision numbers

for some reasons removed in ac5a70c

Refs #262

FIRMWARES

@@ -116,9 +116,9 @@ Currently supported boxes and firmwares
 * Fritz!Box 6820v1 LTE
 	* 142.06.83 rev43648 (German & International)
 	* 142.07.01 rev63482 (German & International)
-	* 07.13 (German & International)
+	* 142.07.13 rev73673 (German & International)
 * Fritz!Box 6820v2 LTE
-	* 07.13 (German & International)
+	* 142.07.13 rev73674 (German & International)
 * Fritz!Box 6840 LTE
 	* 105.06.30 rev31187
 	* 105.06.50 rev33168
@@ -131,7 +131,7 @@ Currently supported boxes and firmwares
 * Fritz!Box 6890 LTE
 	* 162.06.87 rev59283 (German & International)
 	* 162.07.03 rev68723 (German & International)
-	* 07.13 (German & International)
+	* 162.07.13 rev73668 (German & International)
 
 ====== Fritz!Box Fon WLAN (70xx) ======