Merge branch 'bugfix/remove_bt_get_mac_v4.2' into 'release/v4.2'

bt: Remove unused function esp_bt_get_mac. (v4.2)

See merge request espressif/esp-idf!14836

components/bt/include/esp_bt.h

@@ -351,12 +351,6 @@ esp_err_t esp_bt_controller_disable(void);
  */
 esp_bt_controller_status_t esp_bt_controller_get_status(void);
 
-/**
- * @brief  Get BT MAC address.
- * @return Array pointer of length 6 storing MAC address value.
- */
-uint8_t* esp_bt_get_mac(void);
-
 /** @brief esp_vhci_host_callback
  *  used for vhci call host function to notify what host need to do
  */