Whitelist user call activity

Assistant sends an intent that is handled by this activity. Dialer
then handles the UI.

Bug: 146680943
Test: On a Hawk
Say "Call <some name>"
$ adb shell dumpsys activity service com.android.car | grep "Blocked activity log" -A 5
verify that the UserCallActivity was not blocked

Change-Id: Ib584c51604179de80832c60e11e43313a56b3005
diff --git a/service/res/values/config.xml b/service/res/values/config.xml
index c756510..56a12a5 100644
--- a/service/res/values/config.xml
+++ b/service/res/values/config.xml
@@ -64,7 +64,7 @@
           The current implementations expects the following system packages/activities to be
           whitelisted. For general guidelines to design distraction optimized apps, please refer
           to Android Auto Driver Distraction Guidelines. -->
-    <string name="systemActivityWhitelist" translatable="false">com.android.systemui,com.google.android.permissioncontroller/com.android.packageinstaller.permission.ui.GrantPermissionsActivity,com.android.permissioncontroller/com.android.packageinstaller.permission.ui.GrantPermissionsActivity,android/com.android.internal.app.ResolverActivity,com.android.mtp/com.android.mtp.ReceiverActivity</string>
+    <string name="systemActivityWhitelist" translatable="false">com.android.systemui,com.google.android.permissioncontroller/com.android.packageinstaller.permission.ui.GrantPermissionsActivity,com.android.permissioncontroller/com.android.packageinstaller.permission.ui.GrantPermissionsActivity,android/com.android.internal.app.ResolverActivity,com.android.mtp/com.android.mtp.ReceiverActivity,com.android.server.telecom/com.android.server.telecom.components.UserCallActivity</string>
     <!--  Comma separated list of activities that will be blocked during restricted state.
           Format of each entry is either to specify package name to whitelist the whole package
           or use format of "packagename/activity_classname" for tagging each activities.-->