ASoC: Remove unused fields in struct mfld_mc_private

Both *socdev and *codec of struct mfld_mc_private are not being used
in this driver, remove it.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/mid-x86/mfld_machine.c

@@ -54,9 +54,7 @@ static unsigned int	hs_switch;
 static unsigned int	lo_dac;
 
 struct mfld_mc_private {
-	struct platform_device *socdev;
 	void __iomem *int_base;
-	struct snd_soc_codec *codec;
 	u8 interrupt_status;
 };