Merge "Lower error if diskstats cache file not found" into rvc-dev am:...

Merge "Lower error if diskstats cache file not found" into rvc-dev am: 494b541a am: 2d9361b0 am: cb25e886 am: e97392bc

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11750085

Change-Id: I93379cf4d6c86402a7cf637551460fbd4ca632c1