ASoC: wm8400: Fix setting Fout clock divider for FLL Control 4

What we want here is to clear the WM8400_FLL_OUTDIV_MASK bits then
OR with factors.outdiv.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8400.c

@@ -1059,7 +1059,7 @@ static int wm8400_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
 	wm8400_write(codec, WM8400_FLL_CONTROL_3, factors.n);
 
 	reg = wm8400_read(codec, WM8400_FLL_CONTROL_4);
-	reg &= WM8400_FLL_OUTDIV_MASK;
+	reg &= ~WM8400_FLL_OUTDIV_MASK;
 	reg |= factors.outdiv;
 	wm8400_write(codec, WM8400_FLL_CONTROL_4, reg);