Add handoff activity to parental consent flow.

Bug: 188847063
Test: manual
Change-Id: Ib6f38aae487a536fb8e85d608a22378a17c1bc64
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 6f6482d..0c65f01 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1823,6 +1823,10 @@
             android:exported="false"
             android:screenOrientation="portrait"/>
 
+        <activity android:name=".biometrics.BiometricHandoffActivity"
+                  android:exported="false"
+                  android:screenOrientation="portrait"/>
+
         <!-- Must not be exported -->
         <activity android:name=".biometrics.BiometricEnrollActivity$InternalActivity"
             android:exported="false"