dt2w: Fix 3 taps issue when phone is suspended ;)

[PATCH]
This patches fix the doubletap2wake 3 taps issue when phone is suspended.

[Reason]
If phone goes to suspend mode doubletap2wake can't detect touch counts at first.
Also when user touches with suspend mode, kernel is exit suspend mode and enter it again.

[How to fix]
Let the doubletap2wake to know the suspend state.

[Scenario]
1. User touches with suspend mode. So by first touch, kernel is exit suspend mode and enter it again.
2. When suspend state go to exit, change 'dt2w_suspendexit' value to true.
3. 'detect_doubletap2wake' will call by user's touch and check touch counts.
4. If touch counts is 1 and 'dt2w_suspendexit' value is true, plus 1 more to touch counts.
5. So the sum of touch counts will be 2. And wake the device succesfully.