Update DeviceStateChanged for StateTracker compatibility.

State field must be an int32.

Bug: 186257143
Test: deploy metric and verify state tracked correctly
Change-Id: Idbaaf6f4e7c4951e5c781f75717cda080b90a46b
Merged-In: Idbaaf6f4e7c4951e5c781f75717cda080b90a46b
diff --git a/stats/atoms.proto b/stats/atoms.proto
index 8d966e3..97842d3 100644
--- a/stats/atoms.proto
+++ b/stats/atoms.proto
@@ -15292,7 +15292,7 @@
  *     frameworks/base/services/core/java/com/android/server/devicestate/DeviceStateManagerService.java
  */
 message DeviceStateChanged {
-    optional int64 new_device_state = 1
+    optional int32 new_device_state = 1
             [(state_field_option).exclusive_state = true, (state_field_option).nested = false];
     optional bool boot_state = 2;
 }