plugins: add displaycontroller singleton to on/off the display

We have to power the display on/off on the compositor side as with using the android
hwcomposer this is only possible on this side.

Signed-off-by: Simon Busch <morphis@gravedo.de>
Indicate that we want to startup after LunaSysMgr

Signed-off-by: Simon Busch <morphis@gravedo.de>
Merge pull request #62 from webOS-ports/morphis/work

Morphis/work