Merge "Add dataFailCause existence check" into tm-dev am: 9525088a52

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18194002

Change-Id: Ib06fd3cede543892738ae6146b247423c8351920
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

telephony/java/android/telephony/DataFailCause.java

@@ -1673,4 +1673,9 @@ public final class DataFailCause {
             return UNKNOWN;
         }
     }
+
+    /** @hide */
+    public static boolean isFailCauseExisting(@DataFailureCause int failCause) {
+        return sFailCauseMap.containsKey(failCause);
+    }
 }