Remove unnecessary @RequiresApi annotations in FlutterView.java (flutter#180051)

after flutter#175508 has Landed some of these warnings started to appear:
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/>

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Author: AbdeMohlbi

engine/src/flutter/shell/platform/android/io/flutter/embedding/android/FlutterView.java

@@ -1112,7 +1112,6 @@ private void resetWillNotDraw(boolean isAccessibilityEnabled, boolean isTouchExp
 
   // -------- Start: Mouse -------
   @Override
-  @RequiresApi(API_LEVELS.API_24)
   @NonNull
   public PointerIcon getSystemPointerIcon(int type) {
     return PointerIcon.getSystemIcon(getContext(), type);
@@ -1150,7 +1149,6 @@ public void redispatch(@NonNull KeyEvent keyEvent) {
    * <p>See {@link #detachFromFlutterEngine()} for information on how to detach from a {@link
    * FlutterEngine}.
    */
-  @RequiresApi(API_LEVELS.API_24)
   public void attachToFlutterEngine(@NonNull FlutterEngine flutterEngine) {
     Log.v(TAG, "Attaching to a FlutterEngine: " + flutterEngine);
     if (isAttachedToFlutterEngine()) {
@@ -1278,7 +1276,6 @@ public void attachToFlutterEngine(@NonNull FlutterEngine flutterEngine) {
    * <p>See {@link #attachToFlutterEngine(FlutterEngine)} for information on how to attach a {@link
    * FlutterEngine}.
    */
-  @RequiresApi(API_LEVELS.API_24)
   public void detachFromFlutterEngine() {
     Log.v(TAG, "Detaching from a FlutterEngine: " + flutterEngine);
     if (!isAttachedToFlutterEngine()) {