Obsolete the isValid() method in QSerialPortInfo

Task-number: QTBUG-35184
Change-Id: Ie822943bcaf071024bc4f9782441b0534fcbd43d
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>
Obsolete the QSerialPort::UnknownParity enum value  in QSerialPort

Task-number: QTBUG-35215
Change-Id: I53af65ba485216a6fde238245580fe0422a2ed9a
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>