[DeviceDrivers] codec cleanup.
@@ -219,6 +219,7 @@ rt_uint32_t rt_audio_format_to_bits(rt_uint32_t format);
#define CODEC_CMD_SAMPLERATE 3
#define CODEC_CMD_EQ 4
#define CODEC_CMD_3D 5
+#define CODEC_CMD_SWITCH 6
#define CODEC_VOLUME_MAX (63)
