ASoC: rt5682s: Revise the macro RT5682S_PLLB_SRC_MASK

Revise the macro RT5682S_PLLB_SRC_MASK to 0x1
because the mux is only two-source.

Signed-off-by: Derek Fang <derek.fang@realtek.com>
Link: https://lore.kernel.org/r/20210930102928.28628-3-derek.fang@realtek.com


Signed-off-by: Mark Brown <broonie@kernel.org>