Update README (#1251)

* Upgrade to the latest ml307 component

* update README

main/boards/esp-hi/config.json

@@ -7,7 +7,6 @@
                 "CONFIG_IDF_TARGET=\"esp32c3\"",
                 "CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y",
                 "CONFIG_PARTITION_TABLE_CUSTOM_FILENAME=\"partitions/v2/4m.csv\"",
-                "CONFIG_BOARD_TYPE_ESP_HI=y",
                 "CONFIG_ESP_WIFI_STATIC_RX_BUFFER_NUM=3",
                 "CONFIG_ESP_WIFI_DYNAMIC_RX_BUFFER_NUM=4",
                 "CONFIG_ESP_WIFI_AMPDU_TX_ENABLED=n",