wil6210: remove unused including <linux/version.h>

Remove including <linux/version.h> that don't need it.
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/wil6210/cfg80211.c

@@ -21,7 +21,6 @@
 #include <linux/wireless.h>
 #include <linux/ieee80211.h>
 #include <linux/slab.h>
-#include <linux/version.h>
 #include <net/cfg80211.h>
 
 #include "wil6210.h"