bwn_phy_lp_switch_channel
mac->mac_phy.switch_channel = bwn_phy_lp_switch_channel;
error = bwn_phy_lp_switch_channel(mac, 7);
error = bwn_phy_lp_switch_channel(mac, 7);
extern int bwn_phy_lp_switch_channel(struct bwn_mac *, uint32_t);