Fix ErrorPolicyManager#getMostRecentDataFailCause() am: 568d2203c3

Original change: https://android-review.googlesource.com/c/platform/packages/services/Iwlan/+/2210019

Change-Id: Iaa20388b4cb133b54f43520172a4b33f68edd15e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>