All Parcelable CREATOR fields are @NonNull.

If they were null, then the Parcelable would fail to work.

Bug: 126726802
Test: manual
Change-Id: I7929ffa2f20e5de1c8e68e8263cca99496e9d014
Exempt-From-Owner-Approval: Trivial API annotations
diff --git a/core/java/android/os/ShellCallback.java b/core/java/android/os/ShellCallback.java
index 6a62424..632f6c8 100644
--- a/core/java/android/os/ShellCallback.java
+++ b/core/java/android/os/ShellCallback.java
@@ -110,7 +110,7 @@
         }
     }
 
-    public static final Parcelable.Creator<ShellCallback> CREATOR
+    public static final @android.annotation.NonNull Parcelable.Creator<ShellCallback> CREATOR
             = new Parcelable.Creator<ShellCallback>() {
         public ShellCallback createFromParcel(Parcel in) {
             return new ShellCallback(in);