Update notes for submitted changes

* hwc_copybit: wait on fb target acquire fence before composition
* hwc: Do not use copybit if planeAplha and downscaling invloved
* hwc: remove waiting for fence in copybit and avoid sending to mdp
* hwc: Reset layer composition to GLES if copybit fails
* hwc: Enabled COPYBIT for UI layers in VideoOnly composition
* display : Add wormholeRegion Calculation
* liboverlay: Correctly roundoff the Downscale factor
* Revert "overlay: Add tolerance to downscale factor"
* libhwcomposer: Synchronize Uevent and Composition threads
* gralloc: Set default value for implementation defined formats
* Invoke a padding round in certain use-cases.
* liboverlay: Rotator hangs on playing VP9 tile encoded video
* libmemtrack: Fix compilation warning error