qcacmn: Fix wait timeout in policy mgr timer

In policy_mgr_pdev_set_hw_mode_cb, when next_action is PM_OP, it should
also call policy_mgr_set_opportunistic_update, otherwise it would lead to
wait timeout in policy_mgr_check_and_stop_opportunistic_timer.

Change-Id: I74edb72bedfc1a7ec75aa0ded5b855020599cb94
CRs-Fixed: 2481702