Don't fail when acpu_stats is non-monotonic.

This seems to happen very rarely. Submitting this client-side fix which
can be rolled back if we find a root cause.

Test: atest libadaptivecpu_test:KernelCpuFeatureReaderTest
Bug: 219960248
Change-Id: Ibbb54e94a7dbea42adf016bcbbc5f3d9fc63f9c9
Merged-In: Ibbb54e94a7dbea42adf016bcbbc5f3d9fc63f9c9
(cherry picked from commit a0d958ddbe4bff7150744d87ea7fa1c9fbf2db0a)
2 files changed