Enable batterystats for all display IDs

Batterystats used to be enabled only for the default display. This
change enables it for all displays (both for noting screen state and
brightness).

Bug: 366112793
Test: atest DisplayPowerControllerTest
Flag: com.android.server.display.feature.flags.enable_battery_stats_for_all_displays
Change-Id: I12e6ca4c9777fbdc3023e014dbd43fb2361eff06