zero: validate used control-file in KeyDisabler
zero: validate used control-file in KeyDisabler

Change-Id: I8315ca4b0629aa87ce47e32cfc425b7e0c92aa6f

TeamNexus/android_device_samsung_zero-common,TeamNexus/android_device_samsung_zero-common,TeamNexus/android_device_samsung_zero-common,TeamNexus/android_device_samsung_zero-common,TeamNexus/android_device_samsung_zero-common