Cleanup NNAPI Telemetry

This CL removes the following two fields from the Diagnostic*Info
structs: sessionId and packageName

PackageName is not used, and sessionId is changed to be retrieved using
the function android::nn::getSessionId().

Bug: 173392665
Test: mma
Change-Id: I03f4bb0fc889b88d051cd49ab09320e7aec033d2
3 files changed