Galil: reflect motor power status in DB record

The galil IOC sets the motorStatusPowerOn_ asyn parameters, but there is no DB record looking at "MOTOR_STATUS_POWERED". This is a parameter inherited from the model 3 motor driver and not inherant to the galil. The galil has a MTR0101_ON_STATUS PV that links to the GalilMotorOn_ asyn parameter, but this reflects the state of what you asked and not what the galil is currently doing. Maybe better to update GalilMotorOn_ based on real status from motorStatusPowerOn_ ? should check what the new galil driver does in this regard