Fix build failed of Settings test cases while importing AndroidX

- API change in AndroidX Preference causes a build breakage
- Apply explicit casting for the new API interface

Test: robotest
Fixes: 121109361
Change-Id: If3e7be9e53c7860252523700d6721ae4956db68a

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

@@ -105,7 +105,7 @@ public class BuildNumberPreferenceControllerTest {
     public void displayPref_shouldAlwaysDisplay() {
         mController.displayPreference(mScreen);
 
-        verify(mScreen.findPreference(mController.getPreferenceKey()))
+        verify((Preference) mScreen.findPreference(mController.getPreferenceKey()))
                 .setSummary(BidiFormatter.getInstance().unicodeWrap(Build.DISPLAY));
         verify(mScreen, never()).removePreference(any(Preference.class));
     }