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: 47464a5d am: 18030b4d am: 50016195

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

Change-Id: I96bb6bcfc957b523d68c293a9d6203d1a815b7e5