ASoC: codecs: Remove unused reg_cache fields from device structs

The multi-component patch(commit f0fba2ad1) moved the allocation of the
register cache from the driver to the ASoC core. Most drivers where adjusted to
this, but there are quite a few drivers left which now have an unused reg_cache field in
their private device struct.
This patch removes these unused fields.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8750.c

@@ -52,7 +52,6 @@ static const u16 wm8750_reg[] = {
 struct wm8750_priv {
 	unsigned int sysclk;
 	enum snd_soc_control_type control_type;
-	u16 reg_cache[ARRAY_SIZE(wm8750_reg)];
 };
 
 #define wm8750_reset(c)	snd_soc_write(c, WM8750_RESET, 0)