Update notes for submitted changes

* recovery: Always allow the CM release key
Update notes for submitted changes

* Revert "releasetools: add squisher hook"
Update notes for submitted changes

* Bring back squisher as an optional part of the build
Update notes for submitted changes

* Copy extras_file path
Update notes for submitted changes

* Skip updating recovery while generating incremental update
Update notes for submitted changes

* squisher: export TARGET_OTA_EXTRAS_FILE to script