staging: wfx: drop useless filter update when starting AP

mac80211 explicitly call wfx_configure_filters() before/after starting
AP. Thus, it is not necessary to call wfx_update_filtering() from
wfx_start_ap().

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200415161147.69738-19-Jerome.Pouiller@silabs.com


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