Move Keyguard to the systemui process.

This should save some memory on devices with limited amounts of RAM
by allowing it to share the graphics context with systemui.

Initially, adding this to the systemui process triggered a bug where
the shared process id didn't exist in the table yet. The change to
ActiveServices tries to work around this by explicitly adding the package in
attachApplicationLocked().

Change-Id: I9e97d5d69ddd15d7f16aca83a57bdf381811a13b
diff --git a/packages/Keyguard/AndroidManifest.xml b/packages/Keyguard/AndroidManifest.xml
index 7a40a9e7..7d77c48 100644
--- a/packages/Keyguard/AndroidManifest.xml
+++ b/packages/Keyguard/AndroidManifest.xml
@@ -39,7 +39,7 @@
     <uses-permission android:name="android.permission.CHANGE_COMPONENT_ENABLED_STATE" />
 
     <application android:label="@string/app_name"
-        android:process="com.android.systemui.keyguard"
+        android:process="com.android.systemui"
         android:persistent="true" >
 
         <service android:name=".KeyguardService"