Keep display on and block suspend when os update is in progress
Keep display on and block suspend when os update is in progress

A flag file is created when os update is in progress. While the
flag file is present the display should stay on and the device should
not suspend.

[mce] Keep display on and block suspend when os update is in progress. Fixes JB#14675

spiiroin/mce,android-808/mce,mlehtima/mce,mlehtima/mce,maikelwever/mce,android-808/mce,spiiroin/mce,kimmoli/mce,kimmoli/mce,maikelwever/mce,mikkoharju/mce,mlehtima/mce,mikkoharju/mce,kimmoli/mce,kimmoli/mce,android-808/mce,spiiroin/mce,spiiroin/mce,android-808/mce,maikelwever/mce,maikelwever/mce,mlehtima/mce,mikkoharju/mce,mikkoharju/mce