SystemServer: AutoOn: Add flag

Bug: 323060869
Bug: 316946334
Bug: 315241296
Test: m Bluetooth
Change-Id: I07a72381b0acfb9ddc2f08724addde8b50d776d5

flags/system_service.aconfig

@@ -7,6 +7,13 @@ flag {
     bug: "303552318"
 }
 
+flag {
+    name: "auto_on_feature"
+    namespace: "bluetooth"
+    description: "Turn bluetooth on next morning at 5 am"
+    bug: "323060869"
+}
+
 flag {
     name: "system_server_messenger"
     namespace: "bluetooth"