Init.d: Introduce init script to turn off HDMI by default

Due to the introduction of the HDMI_TOGGLE sysfs interface users may want to see this option. HDMI slot accidently thinks sometimes a cable is plugged and tries constantly to read EDIDs from screen (which is NOT plugged though), routes sound through HDMI and starts all other tasks to bring up hdmi.

It saves a lot of power to keep it turned off by default - even when your device has this issue (cable plugged).