Force Feedback has incorrect duration on iOS devices

The user also describes not being able to tell the difference between a force feedback value of 0.3 and 1,0 on iPhones

Note: This is likely an issue somewhere in FIOSInputInterface::SetForceFeedbackChannelValue

1. Create a force feedback effect with a duration of 3 seconds
2. Play this effect somewhere in gameplay code
3. Deploy to iOS and trigger the feedback effect

Result: The feedback is only played for a very short period of time (less then a second) 

Expected: The feedback value would be played for the full duration of 3 seconds