Update notes for submitted changes

* Forward-port surface dithering from CM10.1
Update notes for submitted changes

* Prefer 16bpp surface formats
Update notes for submitted changes

* don't use fence sync for qcom legacy display
Update notes for submitted changes

* separate mHeap-based screenshot from BOARD_EGL_NEEDS_LEGACY_FB
Update notes for submitted changes

* Add overlay support for camera
Update notes for submitted changes

* Select texture target based on pixel format
Update notes for submitted changes

* surfaceflinger: enable EGL_NEEDS_FNW for qcom legacy