Use CP2 for default account setting in AOSP.

1) read the setting from CP2.
2) add an activity to handle the intent to set the setting
when it's the preloaded contacts app.

Test: manual tests.
Bug: 213629089
Change-Id: Ib8338e9a3c4531eb642d1ee6c6a3cea2546a2dc7
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index f47d42a4..c424c80 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -262,6 +262,17 @@
             android:theme="@style/ContactsPreferencesTheme"/>
 
         <activity
+            android:name=".preference.SetDefaultAccountActivity"
+            android:exported="true"
+            android:theme="@style/BackgroundOnlyTheme"
+            android:excludeFromRecents="true">
+            <intent-filter>
+                <action android:name="android.provider.action.SET_DEFAULT_ACCOUNT"/>
+                <category android:name="android.intent.category.DEFAULT"/>
+            </intent-filter>
+        </activity>
+
+        <activity
             android:name=".activities.LicenseActivity"
             android:exported="true"
             android:label="@string/activity_title_licenses"