net_sched: remove internal use of TC_POLICE_*

These should be gone when we removed CONFIG_NET_CLS_POLICE.
We can not totally remove them since they are exposed
to userspace.

Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>