Allow direct dial shortcut in car home app

The new car home application will allow adding shortcuts. Since not
every shortcut makes sense in a car friendly environment, we'd like
to limit the shortcuts.
Shortcuts which should be available in a car friendly environment
need to contain the intent filter category "android.intent.category.CAR_DOCK".
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 07ba3fb..107d877 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -308,6 +308,7 @@
             <intent-filter>
                 <action android:name="android.intent.action.CREATE_SHORTCUT" />
                 <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.CAR_DOCK" />
             </intent-filter>
 
         </activity-alias>