Operation with TVs that do not support the System Audio Mode

Note: according to HDMI spec 1.4b cec 13.15.4.2, when non-TV device
inits System Audio Mode, and the amplifier is the Active Source or is on
the Active Path, amplifier can send <Set System Audio Mode on> without
querying TV's support on SAM.

Test: manual
Bug: 80296135
Change-Id: I5c850e1c906f13e60e7c830e8d3d6d3c8e7f118f
(cherry picked from commit 6ebc6a53ae2b55db1526aac94fb754bfd52522fe)