Add device build information in the backup stage

Insert the device build information in the battery optimization mode
backup stage, such that we can use it to decide whether we should
restore the data in the targeted device or not

Bug: 192523697
Test: make test RunSettingsRoboTests
ROBOTEST_FILTER=com.android.settings.fuelgauge.*

Change-Id: I3ab76e013ea9aca4d336a62e0c7cb6882c5b5085