Commented out PlaceSelectionPluginActivity place picker example (#1258)

Author: Langston Smith

MapboxAndroidDemo/src/global/java/com/mapbox/mapboxandroiddemo/MainActivity.java

@@ -114,7 +114,6 @@
 import com.mapbox.mapboxandroiddemo.examples.plugins.BuildingPluginActivity;
 import com.mapbox.mapboxandroiddemo.examples.plugins.LocalizationPluginActivity;
 import com.mapbox.mapboxandroiddemo.examples.plugins.MarkerViewPluginActivity;
-import com.mapbox.mapboxandroiddemo.examples.plugins.PlaceSelectionPluginActivity;
 import com.mapbox.mapboxandroiddemo.examples.plugins.PlacesPluginActivity;
 import com.mapbox.mapboxandroiddemo.examples.plugins.ScalebarPluginActivity;
 import com.mapbox.mapboxandroiddemo.examples.plugins.SymbolListenerActivity;
@@ -781,14 +780,17 @@ private void initializeModels() {
       R.string.activity_plugins_localization_plugin_url, false, BuildConfig.MIN_SDK_VERSION)
     );
 
-    exampleItemModels.add(new ExampleItemModel(
-      R.id.nav_plugins,
-      R.string.activity_plugins_place_picker_plugin_title,
-      R.string.activity_plugins_place_picker_plugin_description,
-      new Intent(MainActivity.this, PlaceSelectionPluginActivity.class),
-      null,
-      R.string.activity_plugins_place_picker_plugin_url, false, BuildConfig.MIN_SDK_VERSION)
-    );
+    // TODO: The example below is currently commented out because it crashes due
+    //  to incompatibility between the Mapbox Places Plugin and this app's usage
+    //  of AndroidX. This is being tracked at:
+    //  https://github.com/mapbox/mapbox-plugins-android/issues/908
+    /* exampleItemModels.add(new ExampleItemModel(
+    R.id.nav_plugins,
+    R.string.activity_plugins_place_picker_plugin_title,
+    R.string.activity_plugins_place_picker_plugin_description,
+    new Intent(MainActivity.this, PlaceSelectionPluginActivity.class),
+    null, R.string.activity_plugins_place_picker_plugin_url, false, BuildConfig.MIN_SDK_VERSION)
+    );*/
 
     exampleItemModels.add(new ExampleItemModel(
       R.id.nav_plugins,