GATT_GetConnIdIfConnected() function

* Function GATT_GetConnIdIfConnected * Description This function find the conn_id if the logical link for BD address * and application interface is connected * Parameters gatt_if: application interface (input) * bd_addr: peer device address. (input) * p_conn_id: connection id (output) * transport : physical transport of the GATT connection (BR/EDR or LE) * Returns TRUE the logical link is connected