Fix autorotation sensor loop being reactivated even when off

The sensor loop was reactivated even if turned off after a wake up
=> consider it disabled also if !mEnabled
+ turn debug mode on in case there's another issue.

Since the current autorotation sensor loop is generating 3-4% cpu eating,
we really need a way to turn it off for good for the moment.
System_server now seems to stay at 0.0% cpu with this change & autorotation off on TF101

Change-Id: I5ed3c95809f6d789222819466dacc625ac2d9f1d