Update notes for submitted changes

* Initial support for Broadcom VideoCore / BCM21553
Update notes for submitted changes

* WebViewClassic: Add freeMemoryForTests
Update notes for submitted changes

* hwui: add capability to skip fence sync
Update notes for submitted changes

* GLSurfaceView: support RGB_888 surface transformation to RGBA_8888
Update notes for submitted changes

* libhwui: workaround corruption in Broadcom VideoCore GPUs
* libhwui: skip sync/flush in FlushLayerUpdates when fence sync is disabled
Update notes for submitted changes

* SystemUI: add property to disable opengl wallpaper draw
Update notes for submitted changes

* Revert "libhwui: workaround corruption in Broadcom VideoCore GPUs"