staging: wfx: improve API of hif_req_join->infrastructure_bss_mode

In fact "mode" is a boolean that indicates if IBSS mode is used. This
patch fixes the name and uses a more adapted memory representation.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20191217161318.31402-27-Jerome.Pouiller@silabs.com


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