Add global setting for auto-battery saver threshold max

Bug: 74351418
Test: Manual test with "settings put global low_power_trigger_level_max 100"
Change-Id: I9a936facdca64915748f5d85c16edd553a3c6003
diff --git a/core/tests/coretests/src/android/provider/SettingsBackupTest.java b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
index 6c72ac1..22a261e 100644
--- a/core/tests/coretests/src/android/provider/SettingsBackupTest.java
+++ b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
@@ -263,6 +263,7 @@
                     Settings.Global.LOW_BATTERY_SOUND,
                     Settings.Global.LOW_BATTERY_SOUND_TIMEOUT,
                     Settings.Global.LOW_POWER_MODE,
+                    Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL_MAX,
                     Settings.Global.LTE_SERVICE_FORCED,
                     Settings.Global.MAX_NOTIFICATION_ENQUEUE_RATE,
                     Settings.Global.MDC_INITIAL_MAX_RETRY,