DeviceInfo: Wrap prefereces in PreferenceController

Bug: 34774945
Test: make RunSettingsRoboTests
Change-Id: I8bf56b436064684f4d2010e6899548249af69fc3

tests/robotests/src/com/android/settings/deviceinfo/KernelVersionPreferenceControllerTest.java

@@ -0,0 +1,37 @@
+package com.android.settings.deviceinfo;
+
+
+import android.content.Context;
+
+import com.android.settings.SettingsRobolectricTestRunner;
+import com.android.settings.TestConfig;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.annotation.Config;
+
+import static com.google.common.truth.Truth.assertThat;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class KernelVersionPreferenceControllerTest {
+
+    @Mock
+    private Context mContext;
+    private KernelVersionPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mController = new KernelVersionPreferenceController(mContext);
+    }
+
+    @Test
+    public void alwaysAvailable() {
+        assertThat(mController.isAvailable()).isTrue();
+    }
+
+}