Req：Disable Channel Command（0x04）
阻止报文发送到BMC，关闭Passthrough和AEN的传输通道。
Possible values for the 1-bit ALD field are as follows:
0b = Keep link up (establish and/or keep a link established) while channel is disabled
1b = Allow link to be taken down while channel is disabled
Res：Disable Channel Response（0x84）
