Fix lint error in HotwordTrainingAudio.

Adding the new `setHotwordAudio` method is triggering a lint failure
that api is not flagged. Suppressing this for now as this API is
harmless and effectively equivalent to method generated by code.

Bug: 299642269
Test: atest -c CtsVoiceInteractionTestCases:HotwordTrainingAudioTest
Change-Id: I5a3709c2086b27a138ac1b358a68d6e6139cae8e