include/shared/lk: Benchmark Machine Readable Output

Bug: 266065533
Test:
    - export BENCHMARK_MACHINE_READABLE=1
    - trusty/vendor/google/aosp/scripts/build.py qemu-generic-arm64-test-debug --skip-tests
    - Test "com.android.trusty.hwrng.bench"

Change-Id: Ib7ca66dfcb08528225b1529f9b22a2b5c2a2c617
6 files changed