zero: power: add backport-support for 7.1 and older
zero: power: add backport-support for 7.1 and older

Change-Id: I6527056c5185fca0a920c5b7a78b24c5e64ae08d

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