staging: wfx: drop wvif->cqm_rssi_thold

Current code keeps a copy of bss_conf->cqm_rssi_thold in wfx_vif. There
is no sane reason for that.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200115135338.14374-25-Jerome.Pouiller@silabs.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>