ipv6: seg6: remove duplicated include

Remove all but the first include of net/lwtunnel.h from 'seg6_local.c.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@zte.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/seg6_local.c

@@ -30,7 +30,6 @@
 #include <net/seg6_local.h>
 #include <linux/etherdevice.h>
 #include <linux/bpf.h>
-#include <net/lwtunnel.h>
 #include <linux/netfilter.h>
 
 #define SEG6_F_ATTR(i)		BIT(i)