Rename Indexable::getAllPreferenceControllers.

To getPreferenceControllers. "all" is redundant. Then internally, the
old getPreferenceControllers() is renamed to
createPreferenceControllers() to emphasize the controllers are created
from code (versus the ones created from xml).

Bug: 73668763
Test: robotest
Change-Id: Ifec46aefdc2a418031c8e152028b30bdcd396fc7

tests/robotests/src/com/android/settings/enterprise/EnterprisePrivacySettingsTest.java

@@ -98,7 +98,7 @@ public final class EnterprisePrivacySettingsTest {
     @Test
     public void getSearchIndexProviderPreferenceControllers() throws Exception {
         final List<AbstractPreferenceController> controllers
-                = EnterprisePrivacySettings.SEARCH_INDEX_DATA_PROVIDER.getAllPreferenceControllers(
+                = EnterprisePrivacySettings.SEARCH_INDEX_DATA_PROVIDER.getPreferenceControllers(
                 ShadowApplication.getInstance().getApplicationContext());
         verifyPreferenceControllers(controllers);
     }