plfxlc: Remove unused include <linux/version.h>

Eliminate the follow versioncheck warning:

./drivers/net/wireless/purelifi/plfxlc/usb.c: 20 linux/version.h not
needed.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220429075459.72029-1-jiapeng.chong@linux.alibaba.com

drivers/net/wireless/purelifi/plfxlc/usb.c

@@ -17,7 +17,6 @@
 #include <linux/module.h>
 #include <net/mac80211.h>
 #include <asm/unaligned.h>
-#include <linux/version.h>
 #include <linux/sysfs.h>
 
 #include "mac.h"