Update device configuration files to proper hardware type key

Signed-off-by: Simon Busch <morphis@gravedo.de>
Enable support for luna-prefs

Signed-off-by: Simon Busch <morphis@gravedo.de>
Prevent DisplayManager from never going to sleep when not compiled for TARGET_DEVICE

We need to use the new way to determine on which hardware type we're running on at runtime
instead of doing this at compile time.

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