[RESTRICT AUTOMERGE] Log to EventLog on prepareUserStorage failure Bug: 224585613 Change-Id: Id6dfb4f4c48d5cf4e71f54bdb6d0d6eea527caf5 (cherry picked from commit fbb632ea95ac5b6d9efa89e09d0988a9df4f19e4) Merged-In: Id6dfb4f4c48d5cf4e71f54bdb6d0d6eea527caf5