ASoC: remove unused #include <linux/version.h>
Remove unused #include <linux/version.h>('s) in
sound/soc/codecs/ad1836.c
sound/soc/codecs/ad1938.c
sound/soc/codecs/wm8974.c
Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>