Move fingerprint enroll logic into sidecar fragment

So enroll can continue across configuration changes.

Bug: 20495507
Change-Id: I021f2f3e376fcd12c7a698f5fb7f862733cb720a
(cherry picked from commit 64e9c4cb2c7272d07b190cb25c41de5b22563137)
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 0ea75cd..435236a 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -75,6 +75,7 @@
     <uses-permission android:name="android.permission.OVERRIDE_WIFI_CONFIG" />
     <uses-permission android:name="android.permission.USE_FINGERPRINT" />
     <uses-permission android:name="android.permission.MANAGE_FINGERPRINT" />
+    <uses-permission android:name="android.permission.USER_ACTIVITY" />
 
     <application android:label="@string/settings_label"
             android:icon="@mipmap/ic_launcher_settings"