In populate_dot11f_chan_switch_wrapper() host uses channel number to
prepare tx_power_env IE. As channel number is input to
populate_dot11f_tx_power_env(), tx_power_env IE gets wrong values of
max tx power constraints.
Hence input sw_target_freq to populate_dot11f_tx_power_env().
Change-Id: If3112f9e68bdb57cbfd3073ed25f3dcf4f9750d7
CRs-Fixed: 2842552