ASoC: arizona: Support variable FLL VCO multipliers

Some Arizona chips have a higher frequency for the FLL VCO, support this
in the common code.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/arizona.h b/sound/soc/codecs/arizona.h
index b894b64..59caca8 100644
--- a/sound/soc/codecs/arizona.h
+++ b/sound/soc/codecs/arizona.h
@@ -141,6 +141,7 @@
 	struct arizona *arizona;
 	int id;
 	unsigned int base;
+	unsigned int vco_mult;
 	struct completion lock;
 	struct completion ok;