Add error logging in GetRootOfTrust am: a2a1421dd5

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/keymaster/+/18808331

Change-Id: Idb07344573519093cf37be058b6aecf022ea0bad
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>