psh_utils: Use the CPP variant of IPowerStats instead of NDK for efficiency.

Flag: EXEMPT Bugfix
Test: atest service_singleton_tests
Test: power stats show when enabled, after stats service killed
Test: atest powerstats_collector_tests
Test: atest audio_powerstatscollector_benchmark
Bug: 350114693
Change-Id: I37c9035c0a1e9f5647c241a2108f9c0fd56ba0c0