Refactor KernelUidCpuTimeReader

Refactor KernelUidCpu*TimeReader, all extends KernelUidCpuTimeReaderBase.
Refined logging of these classes, avoid spamming system log.

Change-Id: Id8e149ce5be2595292a31de7fe6e1a94cef28bc1
Fixes: 73825907
Test: KernelUidCpu*TimeReaderTest
6 files changed