staging: wfx: drop useless attributes 'filter_prbreq' and 'filter_bssid'

It is now useless to store filter_prbreq and filter_bssid in struct
wfx_vif. We can just pass them as parameters to hif_set_rx_filter().

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200415161147.69738-17-Jerome.Pouiller@silabs.com


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