Fixed SLIDE2WAKE allowing touchscreen to work on call! not any more!

Now when we on call proximity report that to touchscreen driver
and not allow to register touch movement on blank LCD

No more call hangups :)

Thanks to @temasek for the idea.

https://github.com/temasek/android_kernel_samsung_smdk4412/commit/743b6db9811be1b9ced0833d89316d1756323424