BootManager: when reaching normal state create suspend activate marker for sleepd

sleepd needs /tmp/suspend_active as marker to activate suspending the device. If it's not
available it will refuse to suspend.

Signed-off-by: Simon Busch <morphis@gravedo.de>
DisplayStates: don't handle usb in/out events when suspended

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