Instantiate pref controllers from xml if it's defined.

- If a <preference> tag also defines a controller, we will try to
  instantiate it before displaying the UI. The same logic is shared by
  BaseSearchIndexProvider so it also drives search suppression.

- If user also defines a list of controllers programatically, the
  programatically created ones takes precedence.

Bug: 73668763
Test: WIP
Change-Id: I7aecec270bcd3af261e012ef1f6995d2a523cfa1

tests/robotests/src/com/android/settings/search/SettingsSearchIndexablesProviderTest.java

@@ -104,6 +104,7 @@ public class SettingsSearchIndexablesProviderTest {
     }
 
     @Test
+    @Config(qualifiers = "mcc999")
     public void testNonIndexablesColumnFetched() {
         Uri rawUri = Uri.parse("content://" + BASE_AUTHORITY + "/" +
                 SearchIndexablesContract.NON_INDEXABLES_KEYS_PATH);