Adds header guard for audio_reader.h
Adds header guard for audio_reader.h

Change-Id: I2a529c42ec308fe8196810cc7b30a9400c2b4b76
GitOrigin-RevId: 7f115aadf1417b7196538e078657f6b77a007075

google-coral/coralmicro,google-coral/coralmicro,google-coral/coralmicro,google-coral/coralmicro,google-coral/coralmicro