aaudio: remove LOG_ALWAYS_FATAL_IF from metrics

Old assert was for debugging. No longer needed.
Caused a CTS failure in MediaMetrics logging.

Bug: 155188361
Test: atest CtsNativeMediaAAudioTestCases
Test: adb shell dumpsys media.metrics
Change-Id: I592937d6a0683faf6835d3f0d5a982d02f59e7a9