Using 'iw phy' only showed HT20 support in the HT capabilities info.
This patch determines support for HT40 using a firmware query that
is supposed to work for all supported devices.
Reviewed-by: NHante Meuleman <meuleman@broadcom.com>
Reviewed-by: NFranky Lin <frankyl@broadcom.com>
Reviewed-by: NPieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: NArend van Spriel <arend@broadcom.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>