esp_phy: added API esp_btbb_disable

APIs esp_btbb_enable and esp_btbb_disable are supposed to be used by 802.15.4 and Bluetooth module, and implemented with reference counter for resource management

components/esp_phy/include/esp_phy_init.h

@@ -180,6 +180,15 @@ void esp_phy_disable(void);
  */
 void esp_btbb_enable(void);
 
+/**
+ * @brief Disable BTBB module
+ *
+ * Dsiable BTBB module, used by IEEE802154 or Bluetooth.
+ * Users should not call this API in their application.
+ *
+ */
+void esp_btbb_disable(void);
+
 /**
  * @brief Load calibration data from NVS and initialize PHY and RF module
  */