Reclassify FGS and BOUND_TOP as "background" in BatteryUsageStats Bug: 257392992 Bug: 239667114 Test: atest FrameworksCoreTests:BatteryStatsTests Change-Id: Ice58ea7537847441f41ed97c5f8b2bda2b4b7e4d (cherry picked from commit 758ad303e54b9a4b37376f65fce2daad74231976) Merged-In: Ice58ea7537847441f41ed97c5f8b2bda2b4b7e4d