GAP_ConnReadData() function

* Function GAP_ConnReadData * Description Normally not GKI aware application will call this function * after receiving GAP_EVT_RXDATA event. * Parameters: handle - Handle of the connection returned in the Open * p_data - Data area * max_len - Byte count requested * p_len - Byte count received * Returns BT_PASS - data read * GAP_ERR_BAD_HANDLE - invalid handle * GAP_NO_DATA_AVAIL - no data available