Refactor RequestSadAction

Some AVR sends out multiple <Initiate ARC> messages. Upon receiving
these, the TV responds with corresponding RequestSadAction, and the
AVR is required to reply with multiple SADs. However, SADs sent out
later may not be fully responded to before the ARC times out,
resulting in these SADs not being updated.

Bug: 361295470
Test: Tested with Samsung Q99C, CEC can now update SADs correctly.
Flag: EXEMPT bugfix

Change-Id: Ide9c417faa4a18b59d567aedb1a9ad222f621112