Add metric constant for settings preference int value change.

Bug: 64485529
Test: build
Change-Id: Ib9f04ce8f1ff671196c3f269c555288fcc0df35c
Merged-In: Ic5733fc48bc6cab6a9ada73b9e531f9fde787240

proto/src/metrics_constants.proto

@@ -4262,6 +4262,9 @@ message MetricsEvent {
     // OS: O MR
     DATA_PLAN_USAGE_SUMMARY = 1088;
 
+    // FIELD: The numeric preference value (of type int) when it is changed in Settings
+    FIELD_SETTINGS_PREFERENCE_CHANGE_INT_VALUE = 1089;
+
     // Add new aosp constants above this line.
     // END OF AOSP CONSTANTS
   }