staging: btmtk_usb: remove unused including <linux/version.h>

Remove including <linux/version.h> that don't need it.
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/btmtk_usb/btmtk_usb.c

@@ -31,7 +31,6 @@
 #include <linux/completion.h>
 #include <linux/firmware.h>
 #include <linux/usb.h>
-#include <linux/version.h>
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>