Add @UnsupportedAppUsage annotations for max-p.

See go/UnsupportedAppUsage for more details.

These have already been greylisted, however due to bugs/omissions in the tooling have been kept in go/greylist-txt instead of being annotated in the code.

Exempted-From-Owner-Approval: Mechanical changes to the codebase
which have been approved by Android API council and announced on
android-eng@

Bug: 137350495
Test: m
Change-Id: I5aa29a49b193db47aaee4d3a756c17f48cc9f0b1
diff --git a/core/java/android/os/Parcel.java b/core/java/android/os/Parcel.java
index dbe3c93..e1b5542 100644
--- a/core/java/android/os/Parcel.java
+++ b/core/java/android/os/Parcel.java
@@ -3148,6 +3148,7 @@
     // Cache of previously looked up CREATOR.createFromParcel() methods for
     // particular classes.  Keys are the names of the classes, values are
     // Method objects.
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
     private static final HashMap<ClassLoader,HashMap<String,Parcelable.Creator<?>>>
         mCreators = new HashMap<>();