Merge "Add atom for general external storage access stats" into rvc-dev am: b1951ee22d am: f62d71d5d4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11894164

Change-Id: Ia209bc0a417613abbfe8b0a09f3b8a9274a64dfc