[RESTRICT AUTOMERGE] Log to EventLog on prepareUserStorage failure am: 0762961674

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17452194

Change-Id: I534bf5bd4ab88aee8afb8d1bc8f6ab732e966e86
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>