staging: vt6656: mac80211 conversion: vnt_update_ifs change basic rates

Use wBasicRate to find ofdm_rate.

wBasicRate is changed to u32 to match struct ieee80211_bss_conf -> basic_rates

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>