Fix unexpected rotation change when re-enabling auto-rotate

getProposedRotation() method returns old value when re-enabling
auto-rotate option. So you can see unexpected rotation change
with the following steps.

settings -> display -> enable auto-rotate
-> rotate device to landscape -> disable auto-rotate
-> rotate device to portrait -> enable auto-rotate

This patch makes mSensorEventListener reset before it is registered again.

Bug: 7964531

Change-Id: I6a8d287bbd9809ef31de67c54efb885e9a4fd76f
Signed-off-by: Sangkyu Lee <sk82.lee@lge.com>