net/sched: act_api: use tcf_act_for_each_action

Use the auxiliary macro tcf_act_for_each_action in all the
functions that expect a contiguous action array

Suggested-by: Marcelo Ricardo Leitner <mleitner@redhat.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>