Function esp_bt_set_lpclk_src 

pub unsafe extern "C" fn esp_bt_set_lpclk_src(
    lpclk: esp_bt_sleep_clock_t,
) -> esp_err_t

@brief Set the Bluetooth module sleep clock source.

@note This function should be called before esp_bt_controller_init()

@param[in] lpclk Bluetooth sleep clock source

@return - ESP_OK: Success - ESP_ERR_INVALID_ARG: Invalid argument