This patch can make audio controller in AMD Raven Ridge gets runtime
suspended to D3, to save ~1W power when it's not in use.

Cc: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Signed-off-by: NKai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>