Init ARC before init System Audio Mode from AVR

Some TV, for example Mi TV, will only send out requesrt Short Audio
Descriptor when its ARC is alreay on during the SAM initialization.
TV not sending out Short Audio Descriptor will cause TV not sending some
format of audio.

Test: manual
Bug:123157607
Change-Id: I29cc05afb95bc7e478b1fe8aab4a8e5c94925bd7