move event log tags used by system server into this package

We can now locate event log tag definitions in individual packages
(and java constants for the tag numbers get auto-generated), so move
all the tags used by the system server into the package.
diff --git a/services/java/com/android/server/SystemServer.java b/services/java/com/android/server/SystemServer.java
index a0a9a93..73f930d 100644
--- a/services/java/com/android/server/SystemServer.java
+++ b/services/java/com/android/server/SystemServer.java
@@ -70,7 +70,7 @@
 
     @Override
     public void run() {
-        EventLog.writeEvent(LOG_BOOT_PROGRESS_SYSTEM_RUN,
+        EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_SYSTEM_RUN,
             SystemClock.uptimeMillis());
 
         ActivityManagerService.prepareTraceFile(false);     // create dir
@@ -387,7 +387,7 @@
             } catch (RemoteException e) {
             }
         }
-        
+
         // It is now time to start up the app processes...
 
         if (notification != null) {
@@ -411,7 +411,7 @@
         final AppWidgetService appWidgetF = appWidget;
         final WallpaperManagerService wallpaperF = wallpaper;
         final InputMethodManagerService immF = imm;
-        
+
         // We now tell the activity manager it is okay to run third party
         // code.  It will call back into us once it has gotten to the state
         // where third party code can really run (but before it has actually
@@ -421,7 +421,7 @@
                 .systemReady(new Runnable() {
             public void run() {
                 Log.i(TAG, "Making services ready");
-                
+
                 if (batteryF != null) batteryF.systemReady();
                 if (connectivityF != null) connectivityF.systemReady();
                 if (dockF != null) dockF.systemReady();
@@ -429,13 +429,13 @@
 
                 // It is now okay to let the various system services start their
                 // third party code...
-                
+
                 if (appWidgetF != null) appWidgetF.systemReady(safeMode);
                 if (wallpaperF != null) wallpaperF.systemReady();
                 if (immF != null) immF.systemReady();
             }
         });
-        
+
         Looper.loop();
         Log.d(TAG, "System ServerThread is exiting!");
     }