Use pkg-config to determine config flags for LunaSysMgrCommon instead of using $STAGING_INCDIR

Signed-off-by: Simon Busch <morphis@gravedo.de>
Drop all unneeded code and simplify build configuration

Signed-off-by: Simon Busch <morphis@gravedo.de>
Comment code parts which references to components which are no longer existent

Signed-off-by: Simon Busch <morphis@gravedo.de>
Bring back the DisplayManager on startup

Signed-off-by: Simon Busch <morphis@gravedo.de>