system.prop: remove debug.enabletr (has no use) (this is dynamically selected)
             set media.stagefright.enable-scan to true (supposedly fixes video streaming)
ums: add system.prop defines

general: disable low power audio
AndroidProducts: this is how it should be, not the other way around
media_codecs: add media_codecs which were accidentlly removed
overlay: update overlay
         remove dimens (we do fine without it)