Add phenotype flag to disable battery saver tron log

- Also improve dumpsys power output.

Example:
===============================================================================
Battery saving stats:
  Battery Saver state: OFF
  Times enabled: 4

  Drain stats:
                     Battery saver OFF                          ON
  NonDoze NonIntr:      0m      0mAh(  0%)      0.0mAh/h          0m      0mAh(  0%)      0.0mAh/h
             Intr:      0m      0mAh(  0%)      0.0mAh/h          0m      0mAh(  0%)      0.0mAh/h
  Deep    NonIntr:      0m      0mAh(  0%)      0.0mAh/h          0m      0mAh(  0%)      0.0mAh/h
             Intr:      0m      0mAh(  0%)      0.0mAh/h          0m      0mAh(  0%)      0.0mAh/h
  Light   NonIntr:      0m      0mAh(  0%)      0.0mAh/h          0m      0mAh(  0%)      0.0mAh/h
             Intr:      0m      0mAh(  0%)      0.0mAh/h          0m      0mAh(  0%)      0.0mAh/h

Battery saver policy (*NOTE* they only apply when battery saver is ON):
  Settings: battery_saver_constants
    value: send_tron_log=true
  Settings: (overlay)
    value:

  vibration_disabled=true
  animation_disabled=false
  fullbackup_deferred=true
  keyvaluebackup_deferred=true
  firewall_disabled=false
  datasaver_disabled=true
  launch_boost_disabled=true
  :
===============================================================================

Bug: 74742911
Fix: 75024658
Test: atest $ANDROID_BUILD_TOP/frameworks/base/services/tests/servicestests/src/com/android/server/power/batterysaver/BatterySavingStatsTest.java
Test: Manual test with "settings put global battery_saver_constants send_tron_log=true" and
  "settings put global battery_saver_constants send_tron_log=false" with
  logcat | grep 'sysui_multi.*,1302,'

Change-Id: If0593273e21ace7899ac95642dc9feef2515eea1