Update notes for submitted changes

* Disable scissor optimization in the display stack
* SurfaceFlinger: use HAS_CONTEXT_PRIORITY
* setup-makefiles.sh: remove obsolete libaudiopolicy.so reference
* Remove obsolete/unused blobs
* Add a new power HAL
* init.encore.rc: update network interface names for BT tethering
* Lock the CPU clock speed to 1 GHz as early as possible
* Strip debugging symbols from installed wifi modules