drm/radeon/audio: set up the sads on DCE3.2 asics

This sets up the short audio descriptors properly on
DCE3.2 asics for hdmi audio.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --cc drivers/gpu/drm/radeon/r600_hdmi.c
Simple merge

diff --cc drivers/gpu/drm/radeon/r600d.h
Simple merge