Include cached battery usage in app-restriction proto dump

Bug: 203105544
Test: adb shell dumpsys activity app-restrictions --proto |
        gqui from rawproto:- proto
	$ANDROID_BUILD_TOP/frameworks/base/core/proto/android/os/appbatterystats.proto:android.os.AppBatteryStatsProto
	--protoprint_annotations=no
Change-Id: I220908b307fb0df293ae963329f4e16efed295b7