[ Upstream commit 968c974c08106fcf911d8d390d0f049af855d348 ] Including silence detection register as volatile. Signed-off-by: Jack Yu <jack.yu@realtek.com> Link: https://msgid.link/r/c66a6bd6d220426793096b42baf85437@realtek.com Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>