Add some examples

1 RAK4631 adds PlayBackFromSD and VoiceRecognition L1_ PlayBack,
Example VoiceRecognition L1 added to RAK11200_ PlayBack and VoiceRecognition PlayMusic
2 TAS2560 drive adds set_ mute(void); And set_ unmute(void); Control mute and unmute function

3 DSPG in RAK4631_ In the PlayBack.ino example, a timer is added to indicate whether the DSPG is awake
4 Modify the ID of the command word printed by the DSPG driver echoCommands function.