Factor some RestrictedLockUtils out of SettingLib

Also make the new lib only use system-apis.

This allows mainline module to use the new
RestrictedLockUtilsSettingLib.

Unfortunately the whole RestrictedLockUtils would have caused to much
new system-api. Hence it was split into RestrictedLockUtils and
RestrictedLockUtilsInternal. This caused a lot of trivial code changes.

Bug: 110953302
Test: Built
Change-Id: I693b3bf56f3be71f0790776e3aad5694717786ef
diff --git a/packages/SettingsLib/RestrictedLockUtils/AndroidManifest.xml b/packages/SettingsLib/RestrictedLockUtils/AndroidManifest.xml
new file mode 100644
index 0000000..d7b323a
--- /dev/null
+++ b/packages/SettingsLib/RestrictedLockUtils/AndroidManifest.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2018 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="com.android.settingslib.restrictedlockutils">
+
+    <uses-sdk android:minSdkVersion="21" />
+
+</manifest>
\ No newline at end of file