Manage time_in_state tracking from one place

Move functionality related to CPU time_in_state tracking to the
KernelCpuBpfTracking class:
- when to attach the eBPF program to start tracking
- provide available CPU frequencies
- provide CPU cluster (policy) information
- unify the interface of KernelCpuTotalBpfMapReader with other readers

This removes the dependency on the power profile when reading the
information about available frequencies and clusters. It also reduces
the code duplication for transforming that information in
StatsPullAtomService.

Bug: 179485697
Test: existing tests pass
Test: atest CpuStatsTests
Test: cmd stats pull-source 10010
Test: cmd stats pull-source 10095
Test: cmd stats pull-source 10096
Test: cmd stats pull-source 10098
Test: atest FrameworksCoreTests
Change-Id: I17041014343da167b8bdf027ad83887e78ba5c2d