ALSA: ASoC codec: remove unused #include <version.h>

The files below do not use LINUX_VERSION_CODE nor KERNEL_VERSION.
 sound/soc/codecs/ad1980.c
 sound/soc/codecs/wm8580.c
 sound/soc/codecs/wm8900.c

This patch removes the said #include <version.h>.

Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>