[IPV6] Minor clenup: remove two unused definitions in net/ip6_route.h

Remove IP6_RT_PRIO_FW and IP6_RT_FLOW_MASK definitions in
include/net/ip6_route.h, as they are not used in the kernel.
Signed-off-by: NRami Rosen <ramirose@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/ip6_route.h

 #ifndef _NET_IP6_ROUTE_H
 #define _NET_IP6_ROUTE_H
 
-#define IP6_RT_PRIO_FW		16
 #define IP6_RT_PRIO_USER	1024
 #define IP6_RT_PRIO_ADDRCONF	256
 #define IP6_RT_PRIO_KERN	512
-#define IP6_RT_FLOW_MASK	0x00ff
 
 struct route_info {
 	__u8			type;