[Settings] Support getSystemService(Class<T>)

Add getSystemService(Class<T>) to align the capability with framework
part.

This is a back port from aosp/1639943, aosp/1645152 and aosp/1648047

Bug: 179640862
Test: local
Change-Id: I035db55a71f94000ca35f8d71f03c19208423c73

src/com/android/settings/deviceinfo/StorageWizardMigrateConfirm.java

@@ -121,7 +121,7 @@ public class StorageWizardMigrateConfirm extends StorageWizardBase {
         try {
             moveId = getPackageManager().movePrimaryStorage(mVolume);
         } catch (IllegalArgumentException e) {
-            StorageManager sm = (StorageManager) getSystemService(STORAGE_SERVICE);
+            StorageManager sm = getSystemService(StorageManager.class);
 
             if (Objects.equals(mVolume.getFsUuid(), sm.getPrimaryStorageVolume().getUuid())) {
                 final Intent intent = new Intent(this, StorageWizardReady.class);