Add error logging in GetRootOfTrust Bug: 219076736 Test: VtsAidlKeyMintTargetTest Ignore-AOSP-First: Cherry pick from AOSP Change-Id: I9670bc63fb7d9e2c2091357f16bea27e8e3331bf (cherry picked from commit 63bf7285d48413c10b5833d2c9b4438b78c29a4d)