add "hvupdi_variant" property to avrdude.conf

src/config_gram.y

@@ -81,6 +81,7 @@ static int pin_name;
 %token K_DEFAULT_SERIAL
 %token K_DESC
 %token K_FAMILY_ID
+%token K_HVUPDI_VARIANT
 %token K_DEVICECODE
 %token K_STK500_DEVCODE
 %token K_AVR910_DEVCODE
@@ -676,6 +677,12 @@ part_parm :
       free_token($3);
     } |
 
+  K_HVUPDI_VARIANT TKN_EQUAL TKN_NUMBER
+    {
+      current_part->hvupdi_variant = $3->value.number;
+      free_token($3);
+    } |
+
   K_DEVICECODE TKN_EQUAL TKN_NUMBER {
     {
       yyerror("devicecode is deprecated, use "