Cleanup NNAPI platform telemetry code

This CL cleans up and renames NNAPI platform telemetry functions, files,
and comments.

Bug: 232277065
Test: mma
Test: presubmit
Change-Id: I55bb58fcd31b9615705805f9cd81701461321758
Merged-In: I55bb58fcd31b9615705805f9cd81701461321758
(cherry picked from commit 43622d6e90ece04b04b75d3758b701ebe5777b18)
6 files changed