Re-add mklittlefs to package.json

Fix #8057

Author: earlephilhower

package/package_esp8266com_index.template.json

@@ -134,6 +134,11 @@
                      "version": "3.0.0-newlib4.0.0-gnu23-48f7b08",
                      "name": "mkspiffs"
                   },
+                  {
+                     "packager": "esp8266",
+                     "version": "3.0.0-newlib4.0.0-gnu23-48f7b08",
+                     "name": "mklittlefs"
+                  },
                   {
                      "packager": "esp8266",
                      "version": "3.7.2-post1",
@@ -369,4 +374,4 @@
          ]
       }
    ]
-}
+}