Power up display if suspend policy gets disabled

If suspend policy was disabled while display is off, the state machine
oscillated between POWER_OFF states forever instead of powering up the
display and going to LOGICAL_OFF as it is supposed to.

[mce] Power up display if suspend policy gets disabled. Fixes JB#20080
Merge pull request #171 from spiiroin/suspend_policy_lockup

Power up display if suspend policy gets disabled