Write boot image status to statsd. am: ec59f24af9 am: 3cca72aa80 am: 4264e9242c

Original change: https://android-review.googlesource.com/c/platform/art/+/2285073

Change-Id: I9d1e1163ff40fe5c593e6fd7c894a4158b28c706
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>