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

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

Change-Id: I17487fdfe8c9fb8f6aa4e25033e8dc6301d5a172