Update notes for submitted changes

* hwc: Fix klockwork errors
* overlay: Remove obsolete code from pipe config path
* hwc: Consider FLIP flags for partial update.
* hwc: modifying logic in adjust FB Z-order for 4k2kYUVSplit
* hwc: Add display ROI in HWC dumpsys
* hwc: Source Split layers always if indicated by driver
* Revert "display: Revert some problematic changes for now."
* hwc/overlay: Get rot dest dimensions instead of manipulating source