HDMI-CEC: retry for sending <System Audio Mode Request> 

To ensure the audio output is switched reliably, retries are performed in case of NACK or BUSY responses, 
and only critical error (FAIL) is treated as an error immediately. 

Test: atest HdmiCecLocalDeviceTvTest
Bug: b/388983711 
Flag: EXEMPT Bugfix only 

Change-Id: I9de968e895da8bfc0c633a9994018f992433cfad