firmware: Revert upstream patch that breaks audio_render when used without clock
See: http://forum.kodi.tv/showthread.php?tid=192380&pid=1847655#pid1847655

firmware: venc: Release images when error after open occurs which prevents a hang.
See: https://github.com/raspberrypi/userland/issues/206
See: https://github.com/raspberrypi/firmware/issues/328
See: https://github.com/raspberrypi/firmware/issues/254