Add exemption that prevents apps from being suspended

Bug: 246330879
Test: atest AppOpsTests
Change-Id: I5996d5a646467ea6b4d304a3aa55b333ce0989a4
diff --git a/stats/enums/app/enums.proto b/stats/enums/app/enums.proto
index 2432822..4e0e896 100644
--- a/stats/enums/app/enums.proto
+++ b/stats/enums/app/enums.proto
@@ -261,6 +261,7 @@
     APP_OP_BODY_SENSORS_WRIST_TEMPERATURE = 132;
     APP_OP_USE_FULL_SCREEN_INTENT = 133;
     APP_OP_SYSTEM_EXEMPT_FROM_HIBERNATION = 134;
+    APP_OP_SYSTEM_EXEMPT_FROM_SUSPENSION = 135;
 }
 
 /**