IDF release/v4.4 6a7d83af19

* Update toolchain to 2021r2 (#5828)
* Update C3 libs to support only ECO3 and newer

tools/sdk/esp32/include/esp_phy/include/phy.h

@@ -85,6 +85,13 @@ uint8_t phy_dig_reg_backup(bool backup_en, uint32_t *mem_addr);
 void phy_freq_mem_backup(bool backup_en, uint32_t *mem);
 #endif
 
+#if CONFIG_ESP_PHY_ENABLE_USB
+/**
+ * @brief Enable or disable USB when phy init.
+ */
+void phy_bbpll_en_usb(bool en);
+#endif
+
 #ifdef __cplusplus
 }
 #endif