GATT_Connect() function

* Function GATT_Connect * Description This function initiate a connection to a remote device on GATT * channel. * Parameters gatt_if: application interface * bd_addr: peer device address. * bd_addr_type: peer device address type. * is_direct: is a direct connection or a background auto connection * transport : Physical transport for GATT connection (BR/EDR or LE) * Returns TRUE if connection started; FALSE if connection start failure.