Save power component names in the summary parcel for MeasuredEnergySnapshot

Bug: 185534915
Test: mp :BatteryStatsViewer && adb shell am start -n com.android.frameworks.core.batterystatsviewer/.BatteryStatsViewerActivity
  and check that custom component is displayed as "GPU", not "CUSTOM_10000"
Test: atest FrameworksServicesTests:com.android.server.am.MeasuredEnergySnapshotTest
Change-Id: Ibb68bb2ee62678db5f3b30c4f2ef607006ccc81b