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

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

Change-Id: I17b6dae70dd2c67a31c4ddd9cfa48524ea21e7cf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>