lineage-sdk: Use PreferenceDataStore for lineage-sdk preferences

Replaces the need for:
32e67e6020

*) frameworks/support are now built with gradle and are included as prebuilts.

*) API level 26 (8.0) introduced PreferenceDataStorage which can be used
   to implement what we need without touching the support library.

Change-Id: Ide3417019ccf8bde5dca3b2aec3d2075e7c8b597

sdk/src/java/lineageos/preference/SystemSettingSwitchPreference.java

@@ -1,5 +1,6 @@
 /*
- * Copyright (C) 2013 The CyanogenMod project
+ * Copyright (C) 2013 The CyanogenMod Project
+ * Copyright (C) 2018 The LineageOS Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -34,30 +35,19 @@ public class SystemSettingSwitchPreference extends SelfRemovingSwitchPreference
         super(context, null);
     }
 
-    @Override
-    protected boolean persistBoolean(boolean value) {
-        if (shouldPersist()) {
-            if (value == getPersistedBoolean(!value)) {
-                // It's already there, so the same as persisting
-                return true;
-            }
-            Settings.System.putInt(getContext().getContentResolver(), getKey(), value ? 1 : 0);
-            return true;
-        }
-        return false;
-    }
-
-    @Override
-    protected boolean getPersistedBoolean(boolean defaultReturnValue) {
-        if (!shouldPersist()) {
-            return defaultReturnValue;
-        }
-        return Settings.System.getInt(getContext().getContentResolver(),
-                getKey(), defaultReturnValue ? 1 : 0) != 0;
-    }
-
     @Override
     protected boolean isPersisted() {
         return Settings.System.getString(getContext().getContentResolver(), getKey()) != null;
     }
+
+    @Override
+    protected void putBoolean(String key, boolean value) {
+        Settings.System.putInt(getContext().getContentResolver(), key, value ? 1 : 0);
+    }
+
+    @Override
+    protected boolean getBoolean(String key, boolean defaultValue) {
+        return Settings.System.getInt(getContext().getContentResolver(),
+                key, defaultValue ? 1 : 0) != 0;
+    }
 }