Switch to tron events for battery saver logging

Bug: 73293341
Bug: 73296226
Test: atest $ANDROID_BUILD_TOP/frameworks/base/services/tests/servicestests/src/com/android/server/power/batterysaver/BatterySavingStatsTest.java
Test: manual test
Change-Id: I2230a4968b985a2a357b535c980deb1f8adb64df
3 files changed