system.prop: we go fast now

* Disable MDP composition, GPU is now faster somehow
* Remove some stuff that is already default
* Enable tiled rendering, we had problems with this on ics but it's not freezing atm
* Up dynThreshold because Qualcomm said so
Merge branch 'jellybean' of github.com:Dazzozo/android_device_huawei_u8815 into jellybean