net: sched: refactor police action helpers to require tcf_lock

In order to remove rtnl lock dependency from flow_action representation
translator, change rcu_dereference_bh_rtnl() to rcu_dereference_protected()
in police action helpers that provide external access to rate and burst
values. This is safe to do because the functions are not called from
anywhere else outside flow_action infrastructure which was modified to
obtain tcf_lock when accessing action data in one of previous patches in
the series.

Signed-off-by: Vlad Buslov <[email protected]>
Acked-by: Jiri Pirko <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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