[PKT_SCHED]: pkt_cls.h needs pkt_sched.h

Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/pkt_cls.h

 #ifndef __LINUX_PKT_CLS_H
 #define __LINUX_PKT_CLS_H
 
+#include <linux/pkt_sched.h>
+
 /* I think i could have done better macros ; for now this is stolen from
  * some arch/mips code - jhs
 */