ASoC: rt5682: Fix PLL source register definitions

[ Upstream commit ee7ea2a9a318a89d21b156dc75e54d53904bdbe5 ]

Fix typo which causes headphone no sound while using BCLK
as PLL source.

Signed-off-by: Shuming Fan <shumingf@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>