Remove code for API level 20 and below

Summary:
We've deprecated API 20 and below. This is just a cleanup to remove code that assumes API level <21.

Changelog: [Android][Deprecated] Deprecate support of Android API levels 19 and 20.

Reviewed By: fkgozali

Differential Revision: D24380233

fbshipit-source-id: d8f98d7cb19446a60ba36137f1f9290e35f27c02

ReactAndroid/src/main/java/com/facebook/react/uimanager/BaseViewManager.java

@@ -183,8 +183,7 @@ public abstract class BaseViewManager<T extends View, C extends LayoutShadowNode
               && accessibilityState.getType(STATE_CHECKED) == ReadableType.String)) {
         updateViewContentDescription(view);
         break;
-      } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP
-          && view.isAccessibilityFocused()) {
+      } else if (view.isAccessibilityFocused()) {
         // Internally Talkback ONLY uses TYPE_VIEW_CLICKED for "checked" and
         // "selected" announcements. Send a click event to make sure Talkback
         // get notified for the state changes that don't happen upon users' click.